6 Easiest Pet Fish to Keep Happy & Alive

“The popular angelfish is not as delicate or difficult to keep as many people think,” says Yupangco. They are community fish and can live with other tropical community fish quite peacefully. They do grow up to 6 inches in length, though, so they shouldn’t be kept in a tank that’s less than 20 gallons. Adult angelfish can sometimes be aggressive, so don’t introduce young, small fish into a tank with a full-grown angelfish.

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