So I'm officially getting worried. I have a male betta inside of a 1.5g tank with a filter as well as a heater. What he's been doing lately is swimming up and down repeatedly, hitting the gravel headfirst--he looks extremely frenzied and hyper when he does this. He almost looks violent or angry--it's worrying me a lot. This has been going on for a couple of days now. I don't understand why he's doing this? It makes absolutely no sense to me. He'll be calm for a while and then there he goes again with his little up and down dance. Any explanations?