Ok so I’ve had this coral for about 6 months now when I first got it the polyps were a purple color. Now just the top little section is purple and the rest is white. Do I have it too far up in the tank? The light is an AI SOL and is 24 inches from the top of the water the top of the coral is about 12 inches below the surface. They look purple or blue in the pic but it’s not. Any suggestions?