I did try the whole blackout, but it came back not right away but did come back.
I noticed that I was having a problem with it as well so this it what changed it:
Switched to a better skimmer
Raised powerheads up higher off the sand, his made a huge difference not sure why less heat maybe.
Raised light up from the surface, cut light from 12 hours down to 10
Feeding less and rehoming a few fish
Leah
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