I was just feedin my fish and noticed one that was stuck in a hole i dunno how long he was stuck there b i got him out and he is not doing so well and i dunno what else o do for him
You mean he has wounds? Has trouble swimming? What type of fish is it?
Quarentining him/her is a good idea to prevent other fish from picking on him. Adding an antibiotic medication will help prevent any infections in his wounds.