Bio-sponge Filter Small

Our round 2 inch high by 4.75 inch wide sponge filter complete with weighted base and tube to hold the airline will help keep ammonia down in aquariums up to 40 gallons.This is a great for small to mid-size aquariums. Used with an external air pump and connected with airline tubing, sponge filters provide the simplest means of biofiltration for an aquarium. Just keep rinsing every few weeks.