This is my betta, Ol' Blue. He's a very active little guy. My question is, do some bettas prefer the smaller tank? He is currently in a 3L betta tank. I tried to move him to a 3 gallon tank, but he freaked, and got stressed and depressed. I moved him back to his smaller one, and his fins stayed curled up for about a week. He is doing well now and is back to his beautiful active self. Is this weird for a betta, or normal? But anyways, this is my little blue fish. (man he was hard to snap a pic of.)