Do Betta Fish Grow? Size Myths Debunked!

Many aquarists often wonder: do betta fish grow beyond the confines of their tank, or does the persistent myth of limited growth, influenced by outdated aquarium care advice and perpetuated across online forums, hold any truth? Betta splendens, commonly known as betta fish, exhibit specific growth patterns that understanding their biology reveals, dispelling misconceptions about their maximum size and overall development. Reputable resources, like those provided by the American Veterinary Medical Association regarding fish care, highlight the importance of proper tank size and water conditions for optimal growth. Therefore, the size of a betta is more closely related to its genetic potential and environmental conditions than the frequently cited myth of "growing to the size of its tank."

Unlocking the Secrets to Betta splendens Growth

The Betta splendens, also known as the Siamese fighting fish, has captivated aquarium enthusiasts for decades.

Their vibrant colors, flowing fins, and unique personalities make them a popular choice for both novice and experienced aquarists.

As their popularity continues to surge, so does the importance of understanding their specific needs, particularly when it comes to growth.

The Significance of Understanding Betta Growth

Understanding the factors that influence Betta growth is crucial for ensuring their overall health and well-being.

A Betta that is thriving, not merely surviving, will exhibit optimal growth, a clear indication that its needs are being met.

Neglecting these crucial elements can lead to stunted growth, increased susceptibility to disease, and a significantly shortened lifespan.

Debunking Betta Size Myths and Setting Realistic Expectations

One of the most pervasive myths surrounding Bettas is the belief that they can thrive in small containers, even just a cup.

This misconception often leads to inadequate living conditions and stunted growth.

While Bettas are relatively small fish, they require ample space to swim, explore, and exhibit their natural behaviors.

A healthy adult Betta can reach up to 3 inches in length, not including their fins.

Providing them with an appropriately sized aquarium is essential for allowing them to reach their full growth potential.

It’s vital to dispel myths about the minimum tank size requirements and the overall expectations of size.

Defining Optimal Growth: A Key Indicator of a Thriving Betta

Optimal growth in a Betta is not simply about reaching a certain size.

Instead, it’s a holistic indicator of overall health and well-being.

A Betta experiencing optimal growth will exhibit:

• Vibrant colors.
• Healthy appetite.
• Active behavior.
• Strong immune system.

In essence, optimal growth is a reflection of a Betta’s overall quality of life, from the water parameters to their diet.

By understanding and prioritizing the factors that influence Betta growth, aquarists can create an environment where these captivating creatures can thrive, bringing joy and beauty to their keepers.

Creating the Perfect Aquarium Environment for Growth

A Betta’s growth potential is inextricably linked to its environment. Neglecting the fundamental aspects of their habitat can severely stunt their development and compromise their overall well-being. Let’s explore the crucial environmental factors that dictate a thriving Betta.

The Importance of Adequate Tank Size

The size of the aquarium is arguably the most critical factor in determining a Betta’s growth. Smaller tanks are a frequent mistake amongst new Betta owners.

The myth that Bettas thrive in small bowls or cups is demonstrably false and perpetuates inhumane conditions.

A confined space restricts their movement, hinders their ability to express natural behaviors, and ultimately stunts their growth.

Debunking the "Cup Dwelling" Myth

The notion that Bettas can live happily in tiny containers stems from the conditions in which they are often kept in pet stores. These conditions are temporary holding solutions, not suitable long-term habitats.

Confining a Betta to such a small space is akin to keeping a dog in a crate 24/7, severely limiting its quality of life.

Recommending Minimum Tank Size

A minimum of 5 gallons is generally recommended for a single Betta. Larger tanks, such as 10 gallons or more, offer even greater benefits, providing ample swimming space and allowing for a more stable and enriching environment.

Aquascaping for Enrichment and Growth

The internal design of the aquarium, the aquascape, also plays a significant role in a Betta’s growth and overall happiness. A bare tank, while easy to clean, offers little stimulation or refuge for the fish.

Providing Enrichment and Swimming Space

Carefully selected decorations, such as smooth rocks, driftwood, and live plants, can create a more natural and stimulating environment.

These elements provide hiding places where the Betta can retreat and feel secure, reducing stress levels and promoting healthy behavior.

However, it’s crucial to arrange these decorations in a way that leaves plenty of open swimming space. Overcrowding the tank with too many objects can be just as detrimental as having too small of a tank, hindering movement and potentially causing injury.

Live Plants: A Natural Advantage

Live plants, in particular, offer a multitude of benefits. They not only provide shelter and enrichment but also help to oxygenate the water and remove harmful waste products.

Plants also create a more visually appealing and natural environment, which can further reduce stress and encourage healthy growth.

Maintaining Pristine Water Quality

Perhaps the most fundamental aspect of a healthy Betta environment is maintaining pristine water quality. Bettas are sensitive to fluctuations in water parameters, and poor water quality can quickly lead to stress, illness, and stunted growth.

The Nitrogen Cycle: A Balancing Act

Understanding the nitrogen cycle is essential for responsible Betta keeping. Fish waste, uneaten food, and decaying organic matter release ammonia into the water.

Ammonia is highly toxic to fish, even in small concentrations. Beneficial bacteria in the aquarium convert ammonia into nitrite, which is also toxic.

Another type of bacteria then converts nitrite into nitrate, which is significantly less toxic but still needs to be kept at a safe level.

The Role of Filtration Systems

Filtration systems play a crucial role in maintaining a healthy nitrogen cycle. Filters provide a surface area for beneficial bacteria to colonize, effectively removing ammonia and nitrite from the water.

There are three main types of filtration: mechanical, chemical, and biological. A well-rounded filtration system will incorporate all three to ensure optimal water quality.

The Importance of Regular Water Changes

Even with a robust filtration system, regular water changes are essential. Water changes remove accumulated nitrates and replenish essential minerals, keeping the water fresh and healthy for the Betta.

A general rule of thumb is to perform a 25-50% water change once a week, depending on the size of the tank and the bioload. Remember to always use a dechlorinator to remove harmful chlorine and chloramine from tap water before adding it to the aquarium.

Nutrition: Fueling Healthy Growth and Development

A Betta’s growth potential is inextricably linked to its environment. Neglecting the fundamental aspects of their habitat can severely stunt their development and compromise their overall well-being. Let’s explore the crucial role of nutrition in supporting healthy Betta growth.

The Foundation of Growth: A Balanced Diet

A balanced diet is not merely an option, but a necessity for optimal Betta growth and vibrant health.

Understanding their specific nutritional needs is paramount to providing the right fuel for their development.

Bettas are naturally carnivorous, thriving on a diet rich in protein and essential nutrients.

Meeting these dietary requirements is paramount to supporting their overall well-being.

The primary goal of a Betta’s diet is to mirror their natural feeding habits, focusing on high-quality ingredients that promote growth, color vibrancy, and a robust immune system.

Exploring the Diverse World of Betta Food

Choosing the right food is a crucial decision for any Betta owner.

The market offers a variety of options, each with its own advantages and disadvantages.

Understanding these differences is essential for selecting the most suitable food for your Betta’s specific needs and growth stage.

Pellets: A Convenient and Versatile Staple

Pellets are a popular choice due to their ease of use and balanced nutrient composition.

However, not all pellets are created equal.

Look for high-quality pellets specifically formulated for Bettas, with a high protein content and minimal fillers.

Avoid those with excessive amounts of wheat or soy, as these can be difficult for Bettas to digest.

Flakes: A Less Ideal Option

While flakes may seem like a convenient option, they are generally not recommended as a primary food source for Bettas.

They often lack the necessary protein and nutrients, and tend to dissolve quickly, leading to water contamination.

If you choose to feed flakes, use them sparingly as a supplementary food only.

Frozen and Live Foods: Mimicking Nature’s Diet

Frozen and live foods offer a more natural and nutritious option for Bettas.

These foods are rich in protein and essential nutrients, stimulating their natural hunting instincts.

Ideal choices include brine shrimp, bloodworms, daphnia, and mosquito larvae.

These can be offered as treats or as part of a varied diet.

Sourcing live food from reliable suppliers minimizes the risk of introducing parasites or diseases into the aquarium.

The Suitability of Food for Various Growth Stages

A Betta’s nutritional requirements change as they progress through different life stages.

Fry (baby Bettas) require frequent feedings of small, protein-rich foods, such as microworms or baby brine shrimp, to support their rapid growth.

Juvenile Bettas benefit from a balanced diet of high-quality pellets and occasional live or frozen foods to fuel their development.

Adult Bettas can be fed a similar diet, but with less frequency, focusing on maintaining their health and vibrant colors.

Common Feeding Mistakes: Avoiding the Pitfalls

Even with the best intentions, it’s easy to make feeding mistakes that can negatively impact your Betta’s health and growth.

Being aware of these common errors is crucial for ensuring your Betta receives the proper nutrition.

The Dangers of Overfeeding and Portion Control

Overfeeding is one of the most common mistakes in Betta care.

Bettas have small stomachs, and overfeeding can lead to bloating, constipation, and even death.

It also contributes to poor water quality, creating an unhealthy environment for your fish.

A general rule of thumb is to feed your Betta only what they can consume in 2-3 minutes.

Observe your Betta during feeding to gauge their appetite and adjust portion sizes accordingly.

The Consequences of Underfeeding and Ensuring Adequate Nutrient Intake

While overfeeding is detrimental, underfeeding can also have serious consequences.

Insufficient food intake can lead to stunted growth, weakened immune systems, and increased susceptibility to disease.

Ensure your Betta receives adequate nutrients by feeding them a variety of high-quality foods and monitoring their body condition.

A healthy Betta should have a slightly rounded belly, but not be excessively bloated.

If your Betta appears thin or emaciated, increase their food intake gradually until they reach a healthy weight.

Managing Environmental Factors and Stress for Optimal Growth

A Betta’s growth potential is inextricably linked to its environment. Neglecting the fundamental aspects of their habitat can severely stunt their development and compromise their overall well-being. Let’s explore the critical role of environmental stability and stress management in supporting healthy Betta growth.

The Impact of Temperature and pH on Betta Metabolism

Water temperature and pH are fundamental parameters that directly influence a Betta’s metabolism, growth rate, and overall health. Maintaining these parameters within an optimal range is crucial for a thriving Betta.

Optimal Temperature Range

Bettas are tropical fish and require a consistently warm environment. The ideal temperature range for Betta splendens is typically between 78°F and 82°F (25.5°C and 27.7°C).

Lower temperatures can significantly slow down their metabolism, leading to reduced activity, suppressed immune function, and inhibited growth. Conversely, excessively high temperatures can increase metabolic rate to unsustainable levels, potentially shortening their lifespan and exacerbating stress.

Understanding pH and its Importance

pH measures the acidity or alkalinity of the water. Bettas generally thrive in a slightly acidic to neutral pH range of 6.5 to 7.5.

Fluctuations outside this range can cause significant stress, affecting their ability to osmoregulate (maintain proper salt and water balance) and potentially leading to illness.

Sudden pH swings are particularly dangerous, even if the pH remains within a tolerable range. Gradual adjustments are always preferable.

Mitigating Stress Factors in the Aquarium Environment

Stress is a silent killer in the aquarium, and Bettas are particularly susceptible. Recognizing and mitigating stress factors is paramount for promoting healthy growth and preventing disease.

Common Stressors and Their Effects

Several factors can contribute to stress in Bettas, including poor water quality, inadequate tank size, aggressive tank mates, excessive noise or vibration, and a lack of hiding places. Chronic stress weakens the immune system, making them more vulnerable to infections and hindering their growth potential.

Strategies for Stress Reduction

• Maintaining Water Quality: Regular water changes and proper filtration are essential for removing toxins and maintaining stable water parameters.
• Providing Adequate Space: A minimum of 5 gallons (19 liters) is recommended for a single Betta to allow for sufficient swimming space and reduce stress.
• Creating a Calm Environment: Place the aquarium in a quiet location away from direct sunlight, loud noises, and heavy foot traffic.
• Offering Hiding Places: Provide plenty of plants, caves, and other decorations to allow the Betta to retreat and feel secure.

The Detrimental Effects of Overcrowding

Overcrowding is a significant stressor for Bettas and can severely impact their growth and overall health.

Increased Competition and Aggression

In overcrowded conditions, Bettas are forced to compete for resources, leading to increased aggression and stress. Even in tanks with only one Betta, overcrowding due to excessive decorations or tank mates can create a stressful environment.

Compromised Water Quality

Overcrowding leads to a rapid buildup of waste products, such as ammonia and nitrites, which are toxic to fish. This polluted environment can stunt growth, suppress the immune system, and ultimately lead to disease and death.

Stunted Growth and Development

Chronic stress from overcrowding can inhibit a Betta’s growth and development. They may remain significantly smaller than their potential size and exhibit signs of poor health, such as fin clamping and lethargy.

Maintaining a healthy and stress-free environment is not just about aesthetics; it’s about providing the necessary conditions for a Betta to thrive and reach its full growth potential. By carefully managing water parameters, minimizing stress factors, and avoiding overcrowding, aquarists can ensure their Bettas lead healthy, fulfilling lives.

Genetics, Health, and Lifespan: Understanding Potential Limitations

A Betta’s growth potential is inextricably linked to its environment. Neglecting the fundamental aspects of their habitat can severely stunt their development and compromise their overall well-being. Let’s explore the critical role of environmental stability and stress management in supporting healthy development. However, even with impeccable care, genetics, health, and lifespan present intrinsic limitations that every Betta keeper must understand.

The Genetic Blueprint: Nature’s Influence on Size and Longevity

While optimal care significantly impacts a Betta’s well-being, genetics lay the groundwork for its potential size and lifespan. A Betta’s genetic makeup dictates its body structure, immune system strength, and predisposition to certain conditions. Understanding this genetic influence is crucial for setting realistic expectations.

Lineage and Breed Variations

Certain Betta lineages are selectively bred for specific traits, including size and finnage. Giant Bettas (Betta macrostoma), for instance, can reach sizes significantly larger than standard Betta splendens. Recognizing the specific breed or lineage of your Betta allows you to anticipate its potential growth trajectory.

Lifespan Expectations: A Genetic Component

While environmental factors greatly affect longevity, a Betta’s genetics also play a role in determining its lifespan. Typically, well-cared-for Bettas live for 3-5 years, but genetic predispositions can shorten or extend this range. Understanding this helps manage expectations and appreciate the time you have with your Betta.

Health as a Gateway to Growth: Recognizing and Preventing Diseases

A healthy Betta is a growing Betta. Diseases and parasitic infections divert energy away from growth and towards survival. Therefore, proactively identifying and preventing common ailments is crucial for promoting optimal development.

Common Diseases That Hinder Growth

Several diseases commonly affect Bettas, impeding their growth:

• Fin Rot: A bacterial infection that erodes the fins, causing stress and hindering swimming.
• Ich (White Spot Disease): A parasitic infestation that causes white spots on the body, leading to irritation and lethargy.
• Velvet: Another parasitic infection that gives the Betta a dusty or rusty appearance and can be fatal.

Prompt identification and treatment of these conditions are crucial for preventing long-term growth inhibition.

Preventative Measures: A Proactive Approach

Prevention is always better than cure. Maintaining pristine water quality, providing a balanced diet, and minimizing stress are paramount for disease prevention. Quarantine new additions to your aquarium to prevent the introduction of pathogens. Regularly observe your Betta for any signs of illness, such as clamped fins, lethargy, or changes in appetite.

The Shadow of Inbreeding: Compromised Health and Growth

Inbreeding, a common practice in Betta breeding to enhance specific traits, carries significant risks. While it can intensify desired characteristics, it often comes at the expense of genetic diversity and overall health.

Increased Susceptibility to Genetic Disorders

Inbreeding concentrates recessive genes, increasing the likelihood of genetic disorders and weakened immune systems. This can result in Bettas that are more prone to diseases and exhibit stunted growth, even with optimal care.

Ethical Considerations in Breeding Practices

Responsible Betta keepers should be aware of the potential consequences of inbreeding and support breeders who prioritize genetic diversity and the overall health of their fish. Opting for Bettas from reputable breeders who prioritize ethical breeding practices can help ensure a healthier and more robust fish.

Understanding the interplay of genetics, health, and lifespan is crucial for setting realistic expectations and providing the best possible care for your Betta. While we can influence their environment and health, acknowledging these inherent limitations fosters a deeper appreciation for these fascinating creatures and guides responsible Betta keeping.

Stunting: Recognizing and Preventing Growth Inhibition

A Betta’s growth potential is inextricably linked to its environment. Neglecting the fundamental aspects of their habitat can severely stunt their development and compromise their overall well-being. Let’s explore the critical role of environmental stability and stress management.

What is Stunting in Betta Fish?

Stunting, in the context of Betta splendens, refers to the irreversible inhibition of growth, preventing a fish from reaching its genetically determined size and optimal physical development.

It’s a critical concern for Betta keepers, as it reflects an inability to thrive and a life lived far below its potential.

Unlike temporary growth slowdowns due to minor environmental fluctuations, stunting signifies a permanent detriment to the Betta’s physiological development.

This can impact its overall health, lifespan, and quality of life.

How Does Stunting Occur?

Stunting primarily results from inadequate environmental conditions during the Betta’s formative stages.

Poor water quality is a major culprit. High levels of ammonia, nitrites, and nitrates (byproducts of fish waste) are toxic and stress the fish, hindering proper development.

Insufficient tank size is another critical factor. Confined spaces restrict swimming and exercise, leading to muscle atrophy and skeletal deformities.

Imagine being forced to live your entire life in a space too small to even turn around comfortably.

Inadequate nutrition also contributes. A diet lacking essential nutrients, vitamins, and minerals will deprive the Betta of the building blocks necessary for growth.

Finally, chronic stress from overcrowding, aggressive tankmates, or excessive handling can trigger hormonal imbalances.

These imbalances divert energy away from growth and towards survival mechanisms.

The Irreversible Effects of Stunting

The effects of stunting are often irreversible. Once a Betta’s growth plates have closed prematurely due to adverse conditions, it’s nearly impossible to reverse.

The consequences can manifest in various ways.

• Physical Deformities: Curvature of the spine, misshapen fins, and disproportionate body size are common indicators.

• Reduced Lifespan: Stunted Bettas are more susceptible to diseases and infections due to weakened immune systems.

• Impaired Organ Function: Internal organs may not develop fully, leading to chronic health problems and reduced vitality.

• Behavioral Issues: Stunted Bettas may exhibit lethargy, decreased activity levels, and a lack of natural behaviors.

Preventing Stunting: A Proactive Approach

Preventing stunting requires a proactive approach to Betta care, with a focus on providing an optimal environment from the start.

• Adequate Tank Size: Provide a tank of at least 5 gallons (19 liters) for a single Betta. Larger tanks are always preferable.

• Pristine Water Quality: Maintain water parameters through regular water changes (25-50% weekly), proper filtration, and avoiding overfeeding.

• Balanced Diet: Feed a high-quality Betta pellet food supplemented with occasional live or frozen treats like bloodworms or daphnia.

• Stress Reduction: Minimize stress by providing hiding places, avoiding overcrowding, and ensuring compatible tankmates (if any).

Identifying Early Signs

Early detection is crucial. Be vigilant and observe your Betta for any signs of stunted growth.

Pay attention to slow or absent growth, a lack of appetite, lethargy, or any unusual physical deformities.

Consulting with an experienced Betta keeper or a veterinarian specializing in aquatic animals can help with diagnosis and address underlying issues.

By understanding the causes and consequences of stunting, and implementing preventative measures, you can ensure that your Betta thrives and lives a long, healthy, and fulfilling life. Remember, responsible Betta keeping starts with providing an environment where they can reach their full potential.

Ethical Considerations and Responsible Betta Keeping

A Betta’s growth potential is inextricably linked to its environment. Neglecting the fundamental aspects of their habitat can severely stunt their development and compromise their overall well-being. Let’s explore the critical role of ethical considerations and responsible practices in ensuring a vibrant life for these captivating creatures.

The Foundation of Ethical Betta Keeping

Ethical fishkeeping extends beyond mere survival; it’s about creating an environment where Bettas can thrive and exhibit their natural behaviors. This encompasses providing adequate space, proper nutrition, and maintaining pristine water conditions. It’s a commitment to understanding their needs and fulfilling them to the best of our ability.

Upholding the Standard of Care

Responsible Betta ownership starts with recognizing that these are sentient beings with specific requirements. Treating them as mere decorations diminishes their inherent value and disregards their welfare. The bare minimum is not acceptable.

This means ensuring they have ample swimming space, enriching their environment with plants and hiding places, and actively preventing and treating any signs of illness.

Knowledge as Empowerment: Seeking Reliable Guidance

One of the most ethical steps you can take as a Betta keeper is to arm yourself with reliable information. The internet is rife with misinformation, so it’s crucial to discern credible sources from unreliable ones. Look for evidence-based advice and cross-reference information from multiple sources.

Aquarium Societies: A Community of Expertise

Aquarium societies are invaluable resources for both novice and experienced Betta keepers. These organizations often host meetings, workshops, and provide access to experienced hobbyists who can offer personalized guidance.

Their care guides are often meticulously researched and updated, offering a wealth of practical advice on all aspects of Betta care, from tank setup to disease prevention.

The International Betta Congress (IBC): Elevating Betta Keeping Standards

The International Betta Congress (IBC) plays a pivotal role in promoting ethical Betta keeping and advancing knowledge about Betta splendens worldwide. The IBC establishes and maintains standards for judging Bettas in competitions, contributing to selective breeding efforts that prioritize health and vigor.

Moreover, the IBC offers educational resources, including publications and online forums, to help Betta enthusiasts deepen their understanding of these fish and improve their care practices. The IBC encourages responsible breeding, which aims to produce healthy, robust Bettas rather than prioritizing extreme traits that can compromise their well-being.

Essential Tools and Resources for Monitoring Growth

A Betta’s growth potential is inextricably linked to its environment. Neglecting the fundamental aspects of their habitat can severely stunt their development and compromise their overall well-being. Let’s explore the critical role of ethical considerations and responsible practices in ensuring a thriving aquarium ecosystem.

To ensure optimal growth and health for your Betta splendens, simply providing food and a tank isn’t enough. Rigorous monitoring of the aquarium environment is paramount. This involves employing specific tools and resources to maintain stable conditions. Maintaining ideal water parameters and stable temperatures is an ongoing commitment that rewards you with a vibrant, healthy Betta.

Aquarium Test Kits: The Foundation of Water Quality Management

Water quality is arguably the single most crucial factor influencing Betta growth. Ammonia, nitrite, and nitrate levels must be consistently monitored and kept within safe ranges. These are byproducts of the nitrogen cycle. Aquarium test kits are indispensable for this purpose.

• Liquid Test Kits vs. Test Strips: While test strips offer convenience, liquid test kits generally provide more accurate and reliable readings. The investment in a quality liquid test kit is well worth it for the increased precision.

• Essential Parameters to Monitor: At a minimum, you should regularly test for ammonia, nitrite, nitrate, and pH. Understanding the interplay between these parameters is crucial for maintaining a balanced ecosystem.

• Frequency of Testing: Initially, test your water at least twice a week to establish a baseline. Once your tank is stable, weekly testing is usually sufficient. After any water changes or if you notice unusual Betta behavior, immediately test the water.

Maintaining Stable Temperatures: Heaters and Thermometers

Betta splendens are tropical fish and thrive in a specific temperature range of 78-82°F (25.5-28°C). Fluctuations outside this range can cause significant stress and inhibit growth, so monitoring and regulation are vital.

• Reliable Aquarium Heaters: Invest in a quality aquarium heater with an adjustable thermostat. Ensure the heater is appropriately sized for your tank volume. A heater that is too small will struggle to maintain the desired temperature, especially in colder environments.

• Accurate Thermometers: Use a reliable aquarium thermometer to monitor the water temperature. Digital thermometers offer precise readings, but traditional glass thermometers are also effective if properly calibrated. Regularly check the thermometer to ensure the heater is functioning correctly.

• Placement Matters: Position the heater and thermometer strategically within the tank to ensure even heat distribution. Avoid placing them near decorations that could obstruct water flow.

Filtration Systems: Beyond Mechanical Cleaning

While often associated solely with removing debris, a good filter is essential for maintaining biological balance.

• Choosing the Right Filter: Sponge filters are excellent for Betta tanks as they provide gentle filtration without creating strong currents that can stress the fish. Hang-on-back filters are versatile, but ensure the flow is baffled or reduced to prevent turbulent conditions. Internal filters are another option but require careful selection to avoid overpowering the tank.

• The Importance of Biological Filtration: Biological filtration is where beneficial bacteria colonize the filter media, converting harmful ammonia and nitrite into less toxic nitrate. This process is essential for a healthy aquarium ecosystem.

• Filter Maintenance: Regularly clean your filter according to the manufacturer’s instructions. However, avoid over-cleaning the filter media, as this can disrupt the beneficial bacteria colony. Gently rinse the media in used aquarium water to remove debris without killing the bacteria.

So, there you have it! Hopefully, now you’ve got a better understanding of whether or not do betta fish grow and what to expect from your finned friend. Remember, proper care is key to helping them reach their full, healthy size. Happy fishkeeping!