I have a small patch of cyano I’m looking at in my 220 gal. It’s about 3 sq inches. Should I treat whole tank with chemiclean or just suck out that patch and monitor tank ? I’d do a good water change as well
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Personally, when I got a small patch of cyano, I just suck it out. It worked for me even when I had entire rocks coated in that foul stuff. Turkey baster if you can reach, or a standard gravel vac.