I agree that some GFO might be a reasonable idea to try. That's a rather high phosphate level. We get conflicting reports on the effect of phosphate on stony corals, but I'd definitely work on lowering the level if I had stony corals in the system. If GFO gets pricey, there are ways to regenerate it, or switching to lanthanum chloride might be appropriate.
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Jonathan Bertoni
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