burned

Zoa burned skirt, how to solve this problem? Hello reef comunity I have a problem with a certain frag of zoas. They do open up during the day but they have really small or not existing skirt. During the night they have something that looks like cyano. I thought it was a burn from an amonia...

I bought a green BTA from my LFS a while back and it's been remarkably healthy, but moving every night. I figured it was just adjusting to the light cycle/exploring the tank. Yesterday it found a nice crevice in the live rock and seemed to settle down, but this morning I awoke to find that it...