I know that you can't tell from the picture but when it is closed you can see bleaching on the bottom starting to head up very very slowly it's under moderate light and flow water is great everything else is growing like crazy I knew that these were near impossible but when I saw it at a lfs for 20 and it was bigger then a baseball I figured I'd try it
I have a couple red flowerpots and a purple and they like light for sure. Had a green die not to far from my purple no idea why. Good luck. The other colors seem to be a lot tougher
It gets reef snow about twice a week I had it in high light and it wouldn't come out the less flow I gave it the less it extended but to much an it wouldn't come out at all it's been a headache and by far the most touchy coral I've had