Teri Posted February 11, 2022 Share Posted February 11, 2022 (edited) I'm just getting back into aquariums and had an undergravel system before and bought a new lee. I can't get the tank ready for fish. I have killed 4 already. I just purchased the sponge filter from the co-op. Do I need both or should I take out the undergravel and just use sponges. 20 gallon tank. No fish yet because the tank killed then all. Thanks Edited February 11, 2022 by Teri Miss spelling Link to comment Share on other sites More sharing options...
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