Green Star Polyp

[Royal Gramma keeper]

So I have a small green star polyp that I got at the frag swap a while back, and it was growing great for a while, but has recently closed up and has not truly opened up again. It is still growing just not opening, any ideas?

 

[Jfaiii]

How much light is it getting? What are your water params? How long have you had it and has anything changed in your tank recently?

 

[Royal Gramma keeper]

Its under 400 watt metal halides, Nothing has changed recently, I got it in February I think.