ToirCigam Posted December 29, 2021 Share Posted December 29, 2021 Im about to nuke a 55 because of a viral infection that got in. How many sponge filters do I need to buy to run on just sponge filters? New to fish keeping please help!!! Link to comment Share on other sites More sharing options...
xXInkedPhoenixX Posted December 29, 2021 Share Posted December 29, 2021 (edited) Hi @ToirCigam, welcome to the forum- and fish keeping. I have two 20 gallon tanks, I have 2 air driven sponge filters in EACH of them rated for "up to 20 gallon tanks". Aquarium Co-op's are rated "and up" not up to. If you run smaller filters in larger tanks with bigger bio loads you may just have to squeeze them out more often. Honestly if you were shopping on the Aquarium Co-Op page- you could go with 1 large. Personally I like one in each back corner and they are well hidden by plants. Because the Co-ops are so much bigger than the ones I've purchased online and they are coarse not fine- you could do 2 smalls. So if you just want to go with the small size- buy two. Edited December 29, 2021 by xXInkedPhoenixX Link to comment Share on other sites More sharing options...
lefty o Posted December 29, 2021 Share Posted December 29, 2021 2 or 3 small or mediums. Link to comment Share on other sites More sharing options...
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