Penn Plax 5-Way Divider Isolation Breeding Baby Fish Tank-Breeder, Nursery & Display Tank The tank can be used as a single live-bearer trapdouble live-bearer trap, egg layer rod trap, single or double Betta display tank, single or double isolation tank, or a nursery tank. Five-Plus Breeder, Nursery, and Display tank is a multi-use tank. Weight: 0.8200 lbs. Cubes: 0.0026.