cyano growing in low light areas

I have been battling cyano for about 4 months now and have tried the blackout and chemiclean. it keeps comming back but only on thr sand. its caribsea aragonite about an inch deep in a 20long. running an aquaticlife mini skimmer, hob filter for flow, 3 other powerheads, 15% weekly wc and siphon the sand, blow off rock's, reefradiance dm155e leds whites on for about 7 and a half hours, blues on an hour before and after whites off. it mostly grows under rock where its shaded and on the outsides of the tank where the light isn't as intense as the middle. tank is about 6 months old





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