Assorted Fancy Guppies (Poecilia reticulata)

Female guppies get overlooked next to their flashier males, but they're the ones actually running the show — a single female can store sperm from several mates and space out broods for months, which is why a starter colony always needs more girls than boys. This XL female-only group is built for exactly that: pairing with a few flashy males to kick off a serious guppy colony.

Care level: Easy · Temperament: Peaceful · Max size: ~2.5" · Min tank: 10 gal · Diet: Omnivore, flake/pellet + algae