They need at least a few gallons a piece. They eat most anything but prefer live insect larvae and fry. Sexing Guppies can mature by three months. Males are generally smaller, but often longer finned. Mature females are full bodied and have a gravid spot which is a dark spot near their vent.
Males are much more colorful.
They also have a gonopodium which is a modified fin which delivers sperm into the female. Breeding Keep a few females with a male. He will impregnate the females. Guppies are usually able to first breed by the age of three months. One mating can fertilize several batches of live-born fry.