Theplatymaster Posted February 21, 2023 Share Posted February 21, 2023 I have recently had an idea. Put an air stone in a pre filter sponge. Does this have the same effect as a sponge filter? Does it boost BB at all being so close to the air supply? Link to comment Share on other sites More sharing options...
Guppysnail Posted February 21, 2023 Share Posted February 21, 2023 It will grow BB just like hardscape. It will not be as effective as a sponge filter not having a top or uplift tube to pull water through the sponge. Link to comment Share on other sites More sharing options...
Theplatymaster Posted February 21, 2023 Author Share Posted February 21, 2023 On 2/21/2023 at 12:41 PM, Guppysnail said: having a top or uplift tube to pull water through the sponge. i could add one. Link to comment Share on other sites More sharing options...
Guppysnail Posted February 21, 2023 Share Posted February 21, 2023 On 2/21/2023 at 12:44 PM, Theplatymaster said: i could add one. Yes if you add those it becomes a sponge filter. I just cut a hole in a co-op prefilter and slid it over an extra cage with top and tube for a friend. Link to comment Share on other sites More sharing options...
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