How long have you had it?
I had a nice big one and it began doing this and then started pouting, had the thing about a year. It would not get over the pout session so I moved it and it would look a little better and then begin pouting again. THis went on for awhile and the next thing I knew it was dead. I also have a little baby who is doing the same thing. Looked great for the longest time, then began pouting and melted right off the rock, stayed in substrate because it seemed happiest there, mounted it again and it is pouting again, and falling over.....