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how often are you doing water changes. are you buying RODI or making it yourself? Where did you get your rock? its possible it could be leaching phosphates into your tank. most CUC wont eat it unless its short, so you could try some scarlet hermits, or if you want a fish that'll eat algae, you could try a Tailspot blenny. mine picks at my rocks all day. it probably wouldn't make a huge difference though.
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