You tried Lights out method? I have been fighting Dino/Cyano. Acctually thought they are the same? But mine is stringy, seems to increase in higher flow areas too. Also cant grab it at all. I cover tank once a month for 2 days, and sand is brilliant white. Starting to reduce now, hasnt come back like it used to, just a couple small patches
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Dan Pesonen
Umm, a tank or 5
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