Carefree Fish Aquarium Small Sponge Filter for 3~15Gal Fish Tank Quiet for Saltwater and Freshwater with Biochemical Filtration Balls and Biochemical Filtration Sponge Electric 3~15Gal is up for auction in Pet Supplies. The current bid is $1.00, 95% below the $19.99 MSRP, in Good Condition. This auction has ended — similar items appear in live auctions regularly.