Bought a colt coral about 2 wks ago. About a wk ago the branches started to fall off. Tonight it has completely detached itself from the rock it was attached to. Wouldnit give off any smell if dying? Salinity 1.026, alk 5.4, ph 8.4, mag 1250, calcium 500. It was on the sand bed in a low flow spot. Lights are sufficient as I have mh. I know alk is low, working on raising.