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Peacock eels can be good community fish, but sharing the tank can cause some complications in your care of the peacock eels and their companions. Make sure any fish you choose prefer similar water temperatures and conditions to that of the peacock eel. Peacock eels can be more sensitive to changes in their environments than some other fish. Peacock eels will eat smaller fish, so it's best to keep them with fish that are larger than they are. Peacock eels can be aggressive toward smaller fish but don't do well among fish that are much more aggressive than they are. They can be great tank mates provided they share their home with the right kinds of fish. Peacock eels get along well with other fish of the same breed as long as they are of similar size. Peacock eels can get along well with peaceful fish, but you should monitor their interactions to ensure your peacock eels don't hurt the less aggressive fish. Peacock eels and their tank mates are safest when they are all "semi-aggressive" fish. Examples of fish that are safe with peacock eels are swordtails, rainbow fish, and ottocinclus cats. Peacock eels are easily bullied away from food by faster or more aggressive fish. You may need to take special precautions to ensure your peacock eels don't end up going hungry as a result of their tank mates. Try feeding your peacock eels in the evening when other fish are less active. Make sure to watch your peacock eels eat to ensure their food isn't taken by more aggressive fish.
Decide on whether or not you want other fish. Pick the right kinds of tank mates. Make sure your peacock eels eat.