I'm having an impossible time getting my red planet to hold its green color. Mine seems to want to turn solid red. I have it on the bottom of my tank all the way off to the side in what I would consider to be very low light area (maybe 200 par). The only part that is green is a small section of the base that is almost completely shaded. What the trick to keeping the green? I have other SPS in the tank that are a nice solid green.