This would be a good idea to remove cyano as well. I would do a large water change after the lights out period. If you see the algae disappear, it's going somewhere. It's turning back into phosphate and nitrate in your water. The water change would be a good way to remove this.
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I remember when zoanthids were called things like "green" and "orange" and not "reverse gorilla nipple."
Current Tank Info: 180g reef with all the bells and whistles
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