I have seen trying to keep my tank maintenance pretty regular and I have noticed that my zoas are not at all happy and my GSP is dissolving and only 2 polyps we’re open. I checked my chems and they seemed to be where they are supposed to be. With the exception of my ph which is a little low. I did some reading and maybe my lights are up to bright? I have a 300watt mars aqua that hangs about 12 inches above the water line.