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I agree with TimFish about the phosphates. As the corals and other inhabitants absorb the nitrate they will absorb phosphates as well. If there is no phosphate then they wont be able to absorb the nitrate. There is a relationship between the two. The best example I could think of would be the relationship between Alk and Ca. Others have recommended Sodium Triphosphate. Just saying you might want to dose both. Make sure there is a least a measurable amount of phosphate.
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Budget reefing is a pipe dream.
Current Tank Info: 190 gallon DSA mixed reef, 2 X 250W metal halides, 2 X 80w T5's, SRO 3000 skimmer, and a few other goodies under the hood
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