What is this?? Question 

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KrisyH

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Hey all, I have an aquarium with some cory catfish and a betta. After I cleaned the tank the last time I noticed this stuff on the bottom of the tank. Does anybody know what this is??
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lilirose

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It looks to be a buildup of biofilm. It shouldn't harm anything in the tank, though if you don't like how it looks you should remove it.
 
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