I have had my betta for a little over a year now. About a month ago my fish started getting stuck at the top of his tank. I bought a new tank because I thought maybe it was the filter, but that wasn't it. He cant swim down and he is pretty much stuck on his side. He can still swim fine but he is stuck. I was feeding him 5 pellets a day, someitmes more becuase he is a slow swimmer and wouldn't get the food before it hit the bottom. But I cut him down to 2 pellets for about 2 and a half weeks now. He is still stuck though! What do I do?