The Fish Guru

Creating a Healthy Tank Ecosystem for Betta and Goldfish

Betta and Goldfish as Tank Mates

Fishkeeping has become a popular hobby for many individuals, with the Betta and Goldfish being some of the most attractive and commonly kept species. However, potential owners may have concerns about keeping these fish together, given their different environmental requirements and behaviors.

In this article, we will explore the suitability of Betta and Goldfish as tank mates, focusing on water parameters, dietary needs, aggression, tank size, and compatibility.

Water Parameters

Goldfish are cold-water fish, meaning they thrive in temperatures ranging from 65F to 75F. On the other hand, Bettas require warmer water, between 76F and 81F.

Mixing these species in the same tank could cause stress and even illness. To overcome this issue, owners should maintain the water temperature at around 78F so that both fish can live comfortably.

Dietary Needs

Goldfish are herbivores and require a diet rich in plants and vegetables. They can also consume marine protein but in smaller amounts.

In contrast, Bettas are primarily carnivorous and thrive on a high-protein diet. Feeding Goldfish a protein-rich diet could lead to health complications such as constipation, whereas feeding Betta a plant-based diet may leave them without adequate nutrition.

Owners who want to keep these species together should carefully monitor their dietary needs and consider feeding them separately to guarantee that each fish receives a balanced diet.


The Betta fish is known for its aggressive behavior, primarily towards fish with similar body shapes and bright colors. Goldfish, on the other hand, are docile and may nip at the Betta’s fins, causing infections and stress.

To minimize the risk of aggression, owners should keep the Betta fish in isolation or with non-aggressive tank mates. Providing hiding places, such as plants and decorations, could also reduce incidents of aggression.

Tank Size

Goldfish are larger than Bettas and thus require a more extensive aquarium to swim comfortably. An aquarium that is too small may lead to aggressive behavior, and the accumulation of waste may lead to ammonia build-up, causing health issues.

A 20-gallon aquarium is suitable for one Goldfish, whereas a 5-gallon aquarium is adequate for one Betta fish.


Owners who want to keep Betta and Goldfish together should observe them closely and keep an eye on potential territorial disputes. If aggressive behavior persists, it may be necessary to separate the two species.

Additionally, maintaining a clean tank with an adequate filtration system is essential, as tank mates may produce an excess of waste that could harm the fish.

Recommended Tank Mates for Betta Fish

Owners who prefer to keep Betta fish with tank mates must ensure that they select peaceful and compatible species. Aggressive tank mates, particularly those with similar body shapes as the Betta, should be avoided.

Small, agile, and fast-moving species can be good choices, as they will not attract the Betta’s attention.

Peaceful Tank Mates

Peaceful species that are compatible with Betta fish include Neon or Cardinal Tetras, Clown Plecos, Corydoras Catfish, and freshwater shrimp. These species are relatively small in size and do not pose a significant threat to the Betta.

Small Tank Mates

The Ember Tetra, Pygmy Corydoras, Cherry Barbs, and Endlers Guppies are some of the smallest tank mates that can be kept with Betta fish. These species are active and small in size, making them suitable for Bettas kept in smaller aquariums.

Community Tanks

Owners who want a more diverse aquarium may consider creating a community tank. Compatible species with the Betta fish includes Gouramis, Platy fish, Swordtail fish, and Mollies.

However, owners must consider the behavioral patterns, size, and water parameters of each species before introducing them to the Betta’s environment.

Aggressive Tank Mates

Owners must avoid aggressive tank mates when considering adding species to Betta’s environment. This includes any fish with similar body shapes to Betta, such as Guppies, Betta-splendens, and Siamese algae eaters.

While some individuals have reported keeping Betta with these species without incident, it is generally not recommended.


In conclusion, Betta and Goldfish can be compatible tank mates provided owners adhere to their different environmental requirements and behaviors. By ensuring the right water parameters, monitoring the fishes’ dietary needs, minimizing aggression, ensuring an adequate tank size, and carefully selecting compatible tank mates for Betta fish, owners can create and maintain a beautiful and healthy ecosystem.

Recommendations for Keeping Betta Fish in Their Own Tank

Betta fish are often referred to as Siamese fighting fish, as they are known for their exceptional beauty as well as their aggressive behavior. If you are planning to keep a Betta fish, it is best to provide it with its own tank rather than keeping it with other fish.

This article will explore recommendations for keeping Betta fish in their own tank, with a focus on tank size, tank decoration, water parameters, food and feeding, and maintenance.

Tank Size

When it comes to Betta fish, tank size matters. As a minimum, a 5-gallon aquarium is recommended to keep one Betta fish.

However, the larger the tank, the better. A larger tank provides more swimming space and allows for the placement of hiding spots and decorations that will help to provide your Betta with enrichment.

Tank Decoration

In the wild, Betta fish live in densely planted rice paddies, so it is recommended to provide some hiding spots and decorations for your Betta in its tank. These can include live or fake plants, caves, and driftwood.

Bettas are a curious species that enjoy exploring their surroundings, so it’s good to provide some variety in the decorations. You can also move around these decorations every few weeks to keep things fresh and exciting.

Water Parameters

Keeping the right water parameters for your Betta fish is crucial to ensure optimal health and wellbeing. The water temperature should be kept at around 78F, with a pH between 6.5 and 7.5. Regular water changes are essential to maintain water quality and prevent ammonia build-up.

It’s best to change around 25% of the water in the tank every week, or up to 50% every two weeks.

Food and Feeding

Betta fish are carnivores and require a high-protein diet to stay healthy. Feed your Betta small portions twice a day, with high-quality Betta pellets as the main food source.

Pellets are ideal for Bettas and provide them with all the nutrients they need. Overfeeding is a common problem among Betta owners and can lead to obesity and other health issues.

It’s best to feed your Betta as much as it can eat in a few minutes.


Owning a pet Betta fish requires some effort in terms of tank maintenance. A filter is essential to keep the water clean and healthy for your Betta, but it needs to be cleaned regularly.

The frequency of cleaning will depend on the type of filter you have, but it’s recommended to clean it at least once a month. As mentioned above, regular water changes are essential to maintain water quality and keep ammonia levels in check.

In addition to cleaning the filter, it’s also a good idea to keep the decorations clean. They can be cleaned with a soft brush or cloth, and if they are live plants, they may require trimming and fertilizing.

In terms of water quality, a water testing kit can be helpful in monitoring levels of ammonia, nitrates, and nitrites.


Betta fish make beautiful and fascinating pets, but it’s important to understand their specific requirements to ensure their wellbeing. By providing your Betta fish with the right tank size, decorations, water parameters, food and feeding, and regular maintenance, you can guarantee a happy and healthy environment for your Betta fish.

Remember to observe your Betta’s behavior to learn its preferences and adjust its aquarium accordingly. With proper care and attention, your Betta fish could live a long and healthy life.

Keeping Betta fish in their own tank is important to ensure their health and wellbeing. To maintain an optimal environment for your Betta, it’s crucial to consider tank size, decoration, water parameters, food and feeding, and regular maintenance.

The ideal tank size is a 5-gallon aquarium or larger, with plenty of hiding spots and decorations. Keep the water temperature stable at around 78F and a pH between 6.5 and 7.5. Feed your Betta small portions of high-quality Betta pellets twice a day and monitor the water quality through regular maintenance, including filter cleaning and water changes.

Remember to observe your Betta’s behavior, preferences, and adjust accordingly. With proper care and attention, your Betta fish could live a long and happy life.

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