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#1
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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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#2
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Well we can prove this wrong,
I imagine if you had enough phos. to cause a major algae outbreak it would be detectable but depending on your corals (ps. I personally have not seen any bad results but some people have reported phosban effecting corals) you can add phosban. How large are the live rocks? If you dare or have the capacity you can take one of the larger rocks and rest it within distilled water. You will have die off but Phosphates should collect if your theory is true. |