Hi guys, I bought this decoration for my tank last week and I've added 2 shrimp pellet inside for it to cycle and create algae. (Making a new tank) After a week, there's this fluffy or smokey substance at the base of the house decoration. Can anyone tell me what's that? Or what's going on?
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Last edited by Priscilla on 11 Aug 2017 16:56, edited 1 time in total.
Pris 

