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Wow turning the lights off completely for a few hours made a huge difference! I had some red algae almost covering a rock and by this morning like 50% of it was gone!
If u have red algae that receded overnight its more then likely cyno.which tells me yur tank is polluted with nutrients nitrate phosphate with will realy hurt the health of coral.. what is your water parms
Just read all your info sorry I missed it nitrate and phosphate to high for corals u need to do a good pwc to bring them down and maybe run some gfo to get phosphate down