Not too serious but i always worry for my fish, so i just bought a ray motoro pup about 5 inches a month or 2 ago. He eats great and eats variety but sometimes i see him scoot back and flip forwward. But not flip but like spazing out forward. Then he does it again. After a little bit he goes back to normal. He is in a 100 galllon growout tank with a jar arowana. Water chemicals are normal, with a 50-70 percent water change every 2 weeks. Anny idea? 
