Best Seller | Replacement Sponges Filter, Pack of 2 The Replacement Sponges from Imagitarium are suitable for use with The Imagitarium Mini Air-Driven Sponge Filter Kit, which is ideal for up to 5-gallon aquariums as a single source of water filtration or as complimentary water movement in larger... ... more Replacement Sponges Filter, Pack of 2 The Replacement Sponges from Imagitarium are suitable for use with The Imagitarium Mini Air-Driven Sponge Filter Kit, which is ideal for up to 5-gallon aquariums as a single source of water filtration or as complimentary water movement in larger... Petco.com | | $4.99 go to store |