I have my betta in a 2.5 g plastic tank. I think he is seeing his reflection in the plastic. He has been flaring almost non-stop since I got it set up and added him. I don't want him to get stressed. I don't know how to correct the problem, unless I go out and buy a new tank. Which I really don't want to do. I have another betta in the same brand 2.5 g tank and he is not flaring at all. The tanks are set up in two different rooms and there are no mirrors or windows near either. Any ideas on what I can do?