I've had my betta for about 2 weeks now and everything has seemed fine besides the fact that he has not been eating his food, rather spitting it out. I tried crushing up his pellets and that seemed to have worked fine but today he seems off. Since I woke up he was been swimming very fast back and forth along the back of the tank. I tried feeding him but its almost as if he doesn't want any food. I get the sense something is up with him. Any help or advice from experienced owners would be much appreciated.