This morning I noticed a cob web looking substance on the rocks and gravel in my tank. I vacuumed the gravel and, in turn, did a water change. I don't over feed, and the bioload isn't too high, so I'm clueless as to what it could be. The ph is 7.5-8, and nitrite is 0 ppm. Was I just long overdue for cleaning, or what? Is this harmful?
Substrate muk...
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