Green implosion zoa paly, one is a bit brown

[evil nick]

I have a nice frag cluster of about 4 green implosion that have begun splitting and are now about 7 or 8. One of my full grown ones though decided to close up for about 3 days and now has slowly started opening back up but has a dark center, almost black or brown.
I've had them a while now and have never noticed this behavior in them. I know when my green mushroom splits it will move, close, split them open but not get it's color back right away.
It's this possibly similar behavior for these?

Levels seem normal. Thanks

I can try to get a pic tomorrow if it helps

 

[kichimark]

I have seen that happened a couple times with some of my zoas. If it is opening and looks healthy (i.e. not melting) it will regain its color once more so no worries.

 

[evil nick]

I have seen that happened a couple times with some of my zoas. If it is opening and looks healthy (i.e. not melting) it will regain its color once more so no worries.

Thanks! This is one of my fav frags so it had me a bit worried. It's looking a tad better today. Hasn't regained color but open and trying to feed it looks