The MARINA 2 in 1 fish hatchery is ideal to breed and raise fish in community aquariums. First, you place your pregnant fish inside the hatchery. The slotted bottom partition will allow newly-born fry to fall through and away from the mother, to the safety of the bottom chambre. When using the center divider, two pregnant fish can be kept at once. The Marina 2 in 1 hatchery can also double as a safe-house for wounded fish or to segregate aggressive fish from others in the fishtank.