I have been battling an ongoing Zoa issue for at least 6 months now where no matter what I do I can not get them to fully open. Not trying to sound dramatic, but if you name it I have likely tried to do it at one point in time. What brought me to this point, was I wanted to inspect a few frags of my Zoa's that were having issues to see if I could find some kind of bug or pest. What I ended up finding is what appears to be super fine stands of Derbesia growing or attached to the actual polyps skin which i assume irritates the crap out of these Zoa's. Just tossing this here to see what others have to say about these pictures and if by chance you all have a remedy.
Below is a picture of a half open White Zombie frag.
Below is the face/polyp
of a Fire and Ice frag.
Below is a picture of a half open White Zombie frag.
Below is the face/polyp