One more thing... over the past couple months, he's taken to tail biting. But, after the recent stress of the camera and the water change (which he's never been good with, but never this bad!), today his tail looks like below. I don't think it looks like fin rot - looks more like he went at it again, yes? Or just big tears? If the latter, from what?? Is this somehow part of whatever else is wrong with him? He's not catching it on anything in the tank - all my betta tanks are carefully made betta-safe. 
