I will be keeping an eye on this thread for suggestions as well. I have a royal blue half moon that has lovely fins, until I moved him into a divided tank. After about a week he went to shredding/eating his fins. He has since healed up and was looking great, comparatively, and has been moved a time or two but always kept solo. I bought him a new 5 gallon last week, planted with sand and he was oh so happy. Then I added a background to his tank, and within and hour he started shredding his fins, though he was doing it behind the filter so at first I didn't know. Now he is a shredded mess. I guess he doesn't need to be provoked into flaring, cause that seems to be what triggers it for him.
Do you think maybe your caregivers might be agitating him? It sounds like what Emeraldsky said may be the issue. Hopefully for you that will work...Good luck and Happy Holidays!
I really think it sucks to have a fin biter. Mine was so easy going before all of this...:(
Melman, black and white CT,
Fred, Red veil tail<-- started my addiction
Fish Fish, Cellophane Delta
Shimmer, CT maroon and teal with sparkles