Guppy Fish and Goldfish – Are They Good Tank Mates?

Can guppy fish and goldfish live in the same aquarium? Yes, guppies and goldfish can share the same tank. But, bigger goldfish can eat smaller guppy fish. The key to successfully keeping both species of fish together is choosing the right type of goldfish (smaller breeds) and proper tank maintenance.

Things To Note

Guppy Fish and Goldfish Guppies are prolific breeders. Females can give birth to 20-120 baby guppies per month. Both adult guppies and goldfish will eat guppy fry. Thus, it’s best to separate the fry from adult fish. It is best to raise your baby fish in a separate tank until they are big enough to join the adult fish in the main tank. You can also use a breeding box for this purpose but a dedicated tank is best.

Tank Maintenance

Goldfish are known to produce a lot of waste. If you have more than one goldfish, you can expect to do more water changes and tank maintenance than normal. Weekly water changes are enough to remove nitrates from the water. However, for ammonia increases, it is best to have a good filter in place. Frequent water changes and a good filtration system allow both guppies and goldfish to thrive.

Tank Size

A large aquarium is best when keeping both guppy fish and goldfish together. The larger aquarium allows the bigger goldfish to have adequate space.

Water Parameters

Goldfish prefer cool water temperatures. They can survive at 40-78 °F (5-23 °C ). However, guppies require warm waters (around 72-82 °F (22-28 °C ).
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To satisfy both species of fish, temperature around 70 °F is best. Cool enough for the goldfish and warm enough for the guppy fish. As for the pH level, aim for 7 pH. Goldfish prefer acidic water. On the other fin, guppies prefer alkaline water. A pH level of 7 is neutral so it satisfies both fish.


You can keep both guppy fish and goldfish in the same tank. However, you must consider the needs of both fish and come up with an environment that is ideal for both species. Regular water changes, proper tank maintenance, good filtration, a heater, and a neutral pH level are the most important elements when keeping guppies and goldfish together. External resources:

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