Is it possible if anybody can identify what’s going on with my Acro?. There seems to be a white cottony growth on it. Developed about two months ago. The coral itself seems fine growing, and no recession or dead areas on the coral. My parameters are calcium 420, kh 8.5, mag 1350, SG 1.025, nitrates 5, phosphate .05 and they have been pretty stable in those areas for well over a year. My other acro seem to be doing fine and do not have this growth. The degree of this growth seems to ebb and flow throughout the day, but is always at least a little bit on the coral, especially the tips.