I noticed all the corals I have like being lower in the tank. I have a lot of flow almost anywhere but I have been able to see it better since adding them. They are like my guides to the flow you can't see.\n\nI have a brain coral and it is about 18" from my 6x54 T5's and it seems perfect. i will be moving it to the bottom when it grows a little bigger. I just don't want it trampled by crabs or something. I mean I could leave it where it is but when it grows i will most likely move it and that is about 22" down.\n\nTry lowering it 2/3 down for a week. Just my thoughts.