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I have some extra sponge filters I would like to seed with bacteria. If I just sit them in tanks already established will the bacteria build up or would it be better to actually have them running. I figure there will be some bacteria build up without having to run them, but I just wanted to make sure to get the most possible.
 

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Running water circulation though the sponge draws oxygen rich flow though the material and does grow a better colony. Left sitting in the tank you get a surface colony only pretty much.
 
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