It might take some time. I have some sps corals that have had somewhat of a rough past. They went from a tank with inadequate PC lighting, to a tank with LEDs and some bleached while others were still browned. Since putting them in my 65 in November under MHs. 2 of the brown ones are starting to color back up, and one that was bleached really bad is getting its green color back. One still doesn't look good and one is still blah, and all this is almost 3 months later...