Ok, so I am not too new to the reef community (about 6 years) but it seems like the more you know, the less you actually know. So I have been having a recent problem with my acros receding from the base up. It appears like the skin just starts peeling off from the base over a few days-weeks time until the whole colony is completely gone. My levels seem to all be in check-Ca 420-440, Alk 8-9, and Mg at around 1350-1400 and pH at around 8.2-8.3. I am using a dosing pump, so everything is pretty steady (no major swings like I was having with the Ca reactor I used to have a couple months ago). My lighting is (3) 120watt Cad lights LED, and it is a 120 gallon tank. Temp is constantly 76-77 (heater and chiller). Any suggestions?