My 3.5 gal filtered that I keep Rosso in keeps getting this bad protein film. What causes this and is there any way to prevent his water from getting it? Also, what is the best way to get rid of it?
It's a gunk buildup but I don't know the precise mechanism that leads to it. It forms on still water, so a small baffled filter will easily break it up, or drag a paper towel over the top, or stir it up.
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