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My phosphates are 0.01 with a Hanna and have been like that for 4 months now, before that the phosphates were 0.04
The color difference between 0.01 and 0.04 is subtle but it is slightly better at 0.01. What is surprising is the difference in the growth of the corals, they are growing far faster at 0.01 then they did at 0.04.
Don
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