Rats and fish have a wide range of feeding habits and are not picky eaters. Generally, they will eat all the foods that ornamental fish can eat. It is best to feed them with a variety of feeds to make them develop better. Although they eat miscellaneous food, their favorite food is animal feed, especially red worms and silk earthworms. In addition, breeders can also feed them some bumper shrimp, red worms, nematodes, bread worms, Tenebrio molitor, Daphnia, etc., to avoid their picky eaters.

Rats and fish have the function of cleaning the fish tank. They usually eat moss and algae in the fish tank, so breeders don't need to deliberately feed them plant feed at ordinary times.

In addition, breeders can also feed them some synthetic feeds, which have the greatest advantage of comprehensive nutrition and are not easy to pollute water quality. However, this kind of feed cannot be fed for a long time, and it is best to feed it with animal feed.

Rats and fish usually eat some moss and algae, so the feeding frequency does not need to be too high, and the feeding amount does not need to be too large. Breeders can feed it once a day, and each time they are fed to 50% full. If they don't eat too much, they will take the initiative to find food, and they can also clean up the garbage in the fish tank by the way. If they feed too much, they won't eat the food residue in the fish tank, and they will lose the function of cleaning the fish tank.