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I have a 75gal FO. Couple of triggers, eel, lion. I'm starting to get some red algae on some of the live rock. Should I be worried? What should I do to controll it?
Could be cyano. You can control it by removing the nitrates and phospates through more water changes. In preditory tanks like yours with a higher bioload, with more food fed and messy eaters these numbers tend to by higher and algaes can be a problem.