Haha. xD Yeah, I don't know why the neon started doing it so suddenly. He did it the night I made a water change, so maybe he got stressed out and decided to start nipping at my betta?
But I also suspect it could've been my CAE. The tears in Orphan's tail are kind of big for a little neon to do unless the neon was really dedicated to eating my betta's tail off all night. D:
Sometimes the CAE would go after Orphan's tail when he would be swimming around. I never saw him bite or take any chunks of tail off though, but maybe that's what happened and when my neon noticed Orphan's tail was messed up he went and picked off it. I'm not sure if that happened though, but maybe a possibility.
After his tail heals up I'm going to reintroduce him to the tank with the neons and CAE and hope for the best.