Green Star Polyp

[Snufflupagus]

Hello All,

My green star polyp used to be full, bushy and over growing rocks like crazy, I loved the look of it, but recently I add some rock work into my tank and since my green star polyp has totally went into hiding, or dying off. It's a shame really. Of the four pieces I have, only two of them coming out now and even when they are out, they aren't that green, their white center comes out showing more then the green limbs. I'm wondering if anyone can help me in figuring out what would cause this. I've checked all my water levels and things are fine and dandy. Any suggestions would be grand, I'd really like to get my green star polyp back to being thick, bright green looking grass. Thanks in advance.