Crazy. I just went through the same thing. I was dosing vinegar and began running uv... Just because I had a uv light... Cyano showed up and was getting quite bad. Took away uv... cyano has been steadily decreasing and breaking down. Thick gunk in my skimmer again too.
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300 Gal 6x3x28 high Starphire peninsula w/external herbie/bean animal hybrid +150 Gal custom sump with 30gal fuge section, (both built by Concept Aquariums Calgary), 3x Ecotech Radion xr30w g2's(soon to be G3 Pros), Jebao DCT 12000 return pump, 2x Jebao RW 20 powerheads, Tunze Ato, Vertex ro/di, Reef Octopus Ext 200 skimmer run internally.
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