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Discussion Starter · #1 ·
So when I set up my most recent tank, I decided to change out the filter for the Fluval U4 filter. I put it in there and everything. But when I turned it on all this weird white stuff started coming out of it. Does anybody have any idea what that is and why?
 

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Discussion Starter · #3 ·
I do recall rinsing it, though lol Maybe I just didn't rinse it good enough. Biomax are the little white things right?
 
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