Although they are ideal community tank residents with fishes of similar size and temperament, if you intend to breed guppies, it is best to house them in a species-only tank. You can house three pairs in a 10-gallon tank or five to six pairs in a 20-gallon tank. Available today in many color and fin varieties, all these guppies descended from the wild Poecilia reticulata.
The guppy is best housed in a 10- to 20-gallon long tank. This fish needs well-oxygenated water, but do not like much water motion, so a power filter is out. The old-fashioned inside box filter or a large sponge filter seem to work best. Decorate this fish’s tank with live bunch plants (potted) to offer the fish security as well as something to nibble on. Frequent partial water changes are a must because of the many feedings the fish should receive.