Surface agitation is good. I've got 4 koralias 4's in the tank which disturb the surface quite well. I even have tried segments of turning the lights off for up to 10 days at a time which still had no effect. My guess is the live rock is leeching phosphates as the rock is out of my 500 gallon which had a run of bad luck towards the end of its end which led to some neglect and lack of maintenance out of frustration. And my guess is the phosphates is being used up by the algae which is reason for the skewed readings.
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