Ca=395, alk=7.3, mag=1400, sal=1.026, temp=78. However nitrate=50-100 and phosphate=1.0. I just started carbon dosing to deal with the last two items. Tank is 18 months old and just starting to show coralline algae growth. My skimmer is rated for a tank 3x the size of mine. I run two cups of Rox in a carbon reactor. Polyp extension has been poor to nonexistent for many weeks, maybe months, all the way back to when I got the toadstool. Will the high nitrates or phosphates cause this?