Not sure what you're testing with but over shaking with the hanna phosphate test kit can give you some high test results.Moved all corals other than my acros. Everything was looking good after the 30 gallon waterchange, so i went to test the water for the first time in a while. All was good accept for phosphate… 2.06 ppm!?!? Nitrates were pretty low at .02.
Just did a 10 gallon waterchange change. Plan on doing a 30 gallon waterchange in a few days to see if that helps.
