I know its not the lights because I only recently switched to the halides. I had pc's and I still had this issue. Same with the iron dosing. I had this problem before and after. The iron I'm using is Kent Marine super chelated iron. It says "Macro-algae supplement with manganese for reef type marine aquariums" "Provides bio-available iron, manganese and other micronutrients to spur macro-algae growth. Useful for caulerpa and all calcareous algae. Benefits symbiotic algae in coral tissue."
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