what kind of lighting are you using? i ask because your bubble anemone is beautiful, mine was white when i first brought it home but has turned a greenish brown, iam using 4 VHO's 2 whites 2 blue's.
I use Coral life pc 36" 96wattx2. Gets a little indirect sun from the windows being open. Don't kow if that helps? Mine acted the same way for the first month. Its opened up a lot more once the clown took to it.