I have a red open brain coral for about 4 months now and the past few days i started to see some bone showing on the top of it. Can anyone help. I have 2 150w metal halides and VHOs. The brain is in direct light. Should it be under an overhang? Some people say to feed it, some people say no it gets it food from light. I have not seen it extend any tentacles for a long time now.