Betta Fish and Goldfish, a risky mix

Introduce yourself

Betta (Betta splendens), and goldfish, (Carassius auratus), are both popular species of aquarium fish. Each is known for their unique beauty and characteristics. Although both fish species thrive in aquariums they each have their own requirements and personalities. The idea of combining bettas with goldfish can appeal to many aquarium enthusiasts, but it is difficult and dangerous for the fish. We will discuss the main reasons why it is not a good idea to house betta with goldfish together.

The Differences between Habitat Requirements

It is important to note that bettas require a different habitat than goldfish. The betta fish is native to the warm, stagnant waters of Southeast Asia. It thrives in conditions that are tropical with temperatures between 25-28degC and 75-82degF. It prefers densely-planted aquariums and soft, acidic waters.

The goldfish is a cold-water fish native to East Asia. It is best to keep the water between 65-72degF (between 18-22degC) for them. They also generate a large amount of waste that can degrade the quality of water. Goldfish are most suitable for large tanks that have robust filter systems.

When these species are kept together, it is inevitable that one of them will be in suboptimal condition. Bettas kept in cooler water are more likely to become lethargic or susceptible to illnesses. Their vibrant color may fade. In warmer temperatures, goldfish could be stressed out and have problems with their health.

Adversive Behavior

A betta’s temperament is another important factor. Betta fish can be aggressive towards male bettas, and other fish of similar finnage and body form. Their long and flowing fins may trigger aggression as they might mistaken goldfish with rival bettas.

Goldfish tend to be peaceful, and they do not have the same aggression level as bettas. A betta that is placed in a tank with goldfish may suffer stress, injuries, and even die. In the same way, aggressive goldfish could also suffer from stress due to the presence of a betta.

Nutrition and diet

Bettas are carnivorous and require foods high in protein, including bettas pellets, brine shrimp, and bloodworms. Goldfish are omnivores and prefer plant-based diets. Their digestive systems, however, are not equipped to deal with high-protein food. It is not recommended to feed bettas with goldfish, because their nutritional needs differ.

If goldfish are in a tank with bettas, they may not be able to eat as much protein rich food, which can lead to goldfish malnutrition. Goldfish can eat the entire plant-based diet, which will deprive bettas from essential nutrients. It becomes harder to properly meet the nutritional requirements of two species when they are kept together.

Dimensions and growth

Goldfish are capable of growing quite large depending on their type and the environment. Some goldfish reach up to a length of 12 inches. Bettas on the other, grow to be about 2 or 3 inches long. The size of the fish can cause problems, and goldfish could view bettas, or other small fish, as food. This may lead to injury, harassment, or harm.

You can also read our conclusion.

They do not make good tankmates. The significant differences between them, including their habitat, temperament, diet, and potential growth, make cohabitation impossible. It can cause stress, disease, injury or death to one or both of the species.

For the sake of their well-being, you should house your bettas separately from your goldfish. Each species has different needs. If you properly take care of each fish species, they will live a long and happy life. You should always research any specific needs of the fish species that you plan to keep. Ask aquarists or experts for advice if necessary.