Recommend for tanks up to 5 gallons Features 3 pieces to maintain a “betta” home for your fish— Nano aquarium filter, air pump and mini sponge filter. The Cascade Nano Air Pump pumps oxygen into your fish tank at a rate of 1.2 liters per minute and easily connects to an electrical outlet through a power cable. The Cascade Mini Sponge Filter circulates continuous, clean water back into the tank, traps any large pieces in the water and boosts the colonization of healthy bacteria. A powerful yet calming filtration system. Fish and tank are both sold separately. Make your aquatic habitat even “betta” with the Penn-Plax Nano Filter & Air Pump! This kit—which includes the Nano aquarium air pump, airline tubing and mini sponge filter—helps improve the quality of the water through quality filtration. The Cascade Nano Filter and Air Pump work together to circulate continuous, clean water into the tank. The Mini Sponge Filter boosts the colonization of healthy bacteria and traps large particles floating in the water. All in all this kit is fin-tastic for beginners or fish parents looking to improve their aquariums!