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mmhm I get some weird bacteria that only grow on certain surfaces.
If it's gross, you can clean it off, it wont mess up the biological filter, just dont wash out the filter cartridge.
its also really fun to look at various algea/bacteria under a microscope. If you have access to one, I highly recommend looking at your fishy algea. :)
 

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I think it is BB. I have it in my filter too. It's been there for a long time and hasn't caused any problems, so I just leave it alone...
 
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