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fraggin,
I'm not sure I agree with everyone on the phosphate issue... I simply can't imagine you have that much in terms of phosphates coming out of your water. I would suggest a protein skimmer instead of a mechanical filter though. A mechanical filter will never get your nitrate level down... a test kit won't show it, but it's there, just being used up by cyano, algae, etc.
I'm not sure if A-Z pets has a TDS meter, but I live right down the road from there if you want to give mine a try.
Another question... when you're acros/polyps started "flaking" apart, did you remove them from the tank or leave them? If you left them, it could have polluted your tank killing off some of the other corals.
Nick
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