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Hello all can anyone tell me what this white cottony substance is growing on a section of my driftwood. I have a 75 gallon doing a fishless nitrogen cycle. I am at the point where my nitrite levels are coming down, I have live plants in there here is a picture if it helps thanks.
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It looks like bio film. Bio film is not a bad thing. I had that all over the plastic tubing when I first had my tank going.
If you take it out I suggest a turkey baster as it will just float off and annoy you otherwise.
 
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