I got a rasta from someone that grabbed an extra frag. They had dipped it and then brought it to me. It looked amazing for about a week, then open heads started to detach and the whole thing was dead and melted completely off the plug in 3 days. I now have a second one that the heads are closing on and starting to fall off. Any ideas what I should check for or anything I should do? I have dozens of Zoa frags in the tank and really don't want to lose more