Tank has no lights. This fish seriously chased reflections or an invisible fish all day and night long in its 10 gallon. I moved it to a 5 gallon where this situation doesn't happen as often, but he started doing it again. This is what happens after he does that.
Previously, I owned a betta who NEVER chased any reflections at any time. Nothing new was added in my room to cause this type of situation. Temperature is ok, added plants thinking he was stressed about not having any hiding areas. I have a betta log and tons of nice plants, filter, heater, etc. But he got all stressed again....
(he is for sale/trade by the way please check the classifieds if you can re-home him.... I can't take care of him anymore, he needs an expert betta care taker to take care of him).... I want to try to help him heal up before I have to ship him in a small confined area where he will obviously fin nip again. Nothing else lives in his tank and I see him throw these tantrums.
He never did this in his new tank until I showed him a mirror for 30 to 60 seconds for some exercise. I don't know if that was the problem or not, but he did this a few hours after the mirror. He's a feisty boy. No more mirror for him :(