To the pros out there.... Is this mulm build up on my leaves or something else? I don't think I over feed my fish but who knows? I have to wipe away this stuff everyday and it's driving me crazy!!! I shake it off the leaves to try and get the filter (HOB) to suck it up but by the next day it's there again. Some off it looks formed like mulm but the rest is more like a dust. Thoughts??
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