Its your ai sols, they are not on bright enough, i had this problem with mine, i switched from 2 150 watt metal halides to 2 ai sol's and i started them at 50% on blue royal and white 12" from water, i started getting rapid tissue necrosis on my main acropora colony, i thought maybe it was to much light, but then i noticed my green star polyps were going brown, i still thought too much light but i thought na cant be, so i kicked them up to 80% guess what, it was the light lol my green starts are growing so fast, my sps are growing like crazy!!! turn your lights up man, atleast to 50-60%
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