well since my old betta died ive just had his 2.5 gallon sitting there for a couple of months, i went to a lfs today and got a new betta, but since hes been in the tank hes been acting strange, like hes either really excited or somethings wrong. theres no clear signs of any sickness and he seems really happy, just sometimes hell be swimming lazily around, then hell just start swimming super fast along the wall, or hell swim as fast as he can down to the bottom, or around a corner! just a minute ago he swam as fast as possible toward the surface and did a jump (hitting his head on the inside of the hood!). im happy/worried!