Originally Posted by Susukihotaru
This morning it was worse and I am convinced he is biting his tail, could it be he doesn't like when it's dark or gets bored? I wish I could just ask him, this is getting frustrating.
be sure to keep the water very clean for him because it could easily turn into fin rot.
if he's doing it over night when its dark it could be he's waking up too early in the dark and getting bored I think it might help to turn his light on earlier or turn it off later.
its very hard to find out why a betta is tail biting it can be caused by alot of different things but you know your betta best so you have the best chance of finding out why he's doing it
you could try sticking things to the glass see if it gets his attention
I put some white paper at the back of my tank because i notice he was seeing his reflection at the back of the tank when the light was off and winding him self up and i think when he gets angry he bites himself
i've heard of people floating colored bottle caps on the water to get the bettas mind of biting I've never done it myself but it might be something you can try. if you can get IAL that might help too. i've also heard rearranging the decor or getting new decor may help if he's doing because of boredom. or giving him a mirror to flare at for about 5 minutes every now and then but i don't think a mirror would help if he's doing it out of aggression it might just make him worse.