I have a Ice Cap 400 watt with a LumenBrite mini over a 100 gallon cube. Changed from a 20k xm to a new 10 k. Now I have 400 par at the sand and around 800 a few inches up. This cant be good for the corals. I can raise the light 4 or 5 more inches, but its gunna flood the room with light. Will also lessening the photo period help as well?