I have been observing strange activities with Sonic for the last couple weeks. For one, he swims laps around the perimeter of the tank for about a minute at high speed. Another (less common) activity is swimming from the top to a bottom corner, barrel rolling in the process. Also whenever he is fed, he will not eat unless I put the pellets/flakes/bloodworms in the current from the output of the filter, while he hides under the filter, then chased them to the side and traps them in the plants to eat them. Is this normal for bettas? Or is something wrong perhaps with his coordination, balance, brain, etc? Thanks for any answers.