Can Your Betta Fish and Goldfish Coexist in One Tank?

Betta fish, or Siamese fighting fish, are popular pets for their vibrant colors and long, flowing fins. They are hardy, low-maintenance fish but require specific care. Goldfish, on the other hand, are a common pet for beginner fish owners due to their easy maintenance and low cost.

However, they require colder water than betta fish and can grow quite large. While it may seem tempting to introduce the two species to the same tank, it is not advisable.

betta fish cannot live with pet goldfish. Introducing a goldfish to your betta tank can lead to aggression, stress, and potential death for both fish. Do research and understand the specific needs of each type of fish when considering adding them to your aquarium.

This article will explore why betta fish cannot live with goldfish and how to care for each species properly.

Can Betta Fish Live with Goldfish?

No, keeping Betta fish and goldfish together in the same tank is generally not recommended. This is because betta fish are tropical fish that require warm water temperatures, while goldfish are coldwater fish that thrive in cooler temperatures.

Additionally, betta fish are known for their aggressive behavior and territorial nature, which can lead to fights and stress in the same tank as goldfish. Always remember that while some fish species may look aesthetically pleasing together, their compatibility goes beyond just appearances.

Researching and understanding each species’ specific needs and behaviors is crucial before introducing them into the same tank.

Why You Shouldn’t Keep Bettas with Goldfish?

While both species are popular choices for aquariums, they have different requirements and temperaments that make them incompatible tank mates. Here are a few reasons why Betta fish and goldfish should not be kept together:

Water Temperature

Betta fish are tropical fish and require warmer water temperatures ranging from 76°F to 86°F (24°C to 30°C). Goldfish, on the other hand, are coldwater fish and thrive in cooler temperatures, around 68°F to 74°F (20°C to 23°C). Maintaining a suitable temperature for both species in the same tank can be challenging and compromise their health.

Tank Size

Betta fish typically require smaller tanks due to their smaller size and territorial nature. On the other hand, goldfish can grow quite large and produce a significant amount of waste. They need ample space and larger tanks with adequate filtration to thrive.

Housing them together in the same tank can result in overcrowding and poor water quality, which can be harmful to both species.

Aggression and Compatibility

Betta fish are known for their territorial behavior, especially males. They often display aggression towards other fish, including goldfish.

Read More  Crowntail Betta Fish: The Ultimate Guide To Lifespan, Care Guides And More!

On the other hand, goldfish are generally peaceful but can be active swimmers and may unintentionally stress or injure the slower-moving Betta fish. This combination can lead to constant stress, aggression, and potential harm to one or both species.

Diet and Feeding

Betta fish have a primarily carnivorous diet, requiring high-protein foods such as pellets, flakes, and live or frozen foods. Conversely, goldfish are omnivorous and thrive on a diet of pellets, flakes, and plant matter. The dietary differences can make providing suitable nutrition for both species in the same tank challenging.

Factors to Consider If You Want to Goldfish and Betta Together

Betta fish are known to be territorial, which can raise concern when considering tank mates. While it is possible for betta fish to live with goldfish, there are several important factors to consider before introducing them to the same aquarium.

Appropriate Tank Size

One of the most significant factors is tank size. Since betta fish thrive in smaller tanks while goldfish require larger tanks, pick the right size tank to accommodate both fish. Moreover, water conditions are essential to keep an eye on.

Water Parameter

Betta fish prefer warmer water with a ph between 6. 5 to 7. 5, while goldfish prefer cooler water with a ph of 7. 2 to 7. 6. Compatible water conditions are a must to keep them healthy and happy.

Is it Safe to Use Aquarium Salt in a Tank with Both Betta Fish and Goldfish?

When considering the use of aquarium salt in a tank housing both betta fish and goldfish, it is crucial to understand the potential aquarium salt effects on betta fish. While goldfish tolerate salt well, betta fish are freshwater species and can be negatively impacted by excess salt. Careful consideration and monitoring of salt levels in the tank are necessary to ensure the well-being of both fish species.

How to Set Up The Tank for Both Species?

Setting up a tank for betta fish and goldfish requires special considerations to ensure the well-being of both species. Here’s a step-by-step guide on how to set up the tank for them:

Choosing an Appropriate Tank

Select a tank size that can comfortably accommodate the betta fish and goldfish. Aim for a larger tank to provide ample swimming space and to minimize territorial conflicts. Consider the needs of the goldfish, as they can grow quite large. A tank capacity of at least 20 gallons (75 liters) is recommended.

Read More  The Complete Guide to Double Tail Betta Fish: Lifespan, Care Guides, And More!

Creating Separate Spaces

Since betta fish are territorial, creating distinct spaces within the tank for each fish is crucial. Use tank dividers or add decorations, such as rocks or plants, to create visual barriers. This will help prevent aggression and provide separate territories for each fish.

Substrate and Decorations

Add an appropriate substrate, such as rocks or sand, to the bottom of the tank. Ensure the substrate is smooth and does not pose a risk of injury to the betta fish or goldfish. Include a few decorations, like plants or caves, for both fish to hide behind and explore. This will provide enrichment and help reduce stress.

Filtration and Water Quality

Install a filtration system suitable for the tank size to maintain optimal water quality. Both betta fish and goldfish produce waste, so an efficient filter is essential for removing impurities and maintaining a healthy environment. Regular water changes are also necessary to check ammonia and nitrate levels.

Temperature Control

Goldfish are coldwater fish, while betta fish require warmer temperatures. It is challenging to meet the ideal temperature range for both species in the same tank. Consider carefully monitoring the water temperature and adjusting it to a compromise that is within an acceptable range for both fish. Consult with an experienced aquarist or specialist for specific temperature recommendations.

Introducing the Fish

Introduce the fish slowly and monitor their behavior closely. Watch for signs of aggression or stress. If any fish show signs of aggression, consider repositioning the tank decorations or adding additional visual barriers to reduce conflicts. If aggression persists, separating the fish into individual tanks may be necessary.


Living together bettas and goldfish is not usually a good idea, as they have different needs in terms of water temperature, food, and space. Goldfish need colder water, while bettas thrive in warmer water, and goldfish tend to be more aggressive and can nip at the fins of the betta.

However, if you do decide to try to house them together, there are some tips you can follow, such as ensuring that there is plenty of space and hiding spots, monitoring their behavior for signs of aggression, and providing them with a varied and nutritious diet.

Ultimately, it’s probably best to keep your betta and goldfish in separate tanks to ensure they both thrive and live happy and healthy lives. Remember, providing optimal living conditions for your pets will go a long way in keeping them healthy and happy for years to come.

Similar Posts