Simon the beta doesn't seem to like any of the food I've been giving him. I've tried regular flake food, blood worms, and something else that I don't remember (tannish, slightly powdery/crumbly). He just kinda floats around and looks at it. Every once in a while he'll pick at it and spit it back out. When I first got him he was eating just fine, especially the blood worms. Is there something else I should try? He's very healthy, still swimming around happy, just not really eating - that I've seen. He does pick at the bottom, though, like a little bottom feeder, which I thought was weird.