ok so we overhauled the tank on saturday, changed from gravel to tahitian moon sand. the fist were in buckets with bubblers for some time, while we removed the old gravel, cleaned everything, put the new sand in, waited for it to settle...etc. anyway the pleco and our dwarf gourami were in a bucket by themselves. the pleco was fine when he went in...when we took him out and put him back in the tank, I noticed that he had a hole in his dorsal fin...near the top between his fist and second spine. its was small and oval shaped. it didnt look rotted..it was a clean hole...almost like someone poked a hole in it. anyway its been 2 days and the small hole has went from small to the point now from where the bottom of the hole was up is gone. is this something I should be concerned about or did he just injure himself somehow and hope it grows back. thanks.