I recently upgraded Beau from a 2 gallon to a 5 gallon. He now has a filter and new (fake) plants. He seems to like it. He's even making a bubble nest and seems to fan out his fins more often. HOWEVER he's also flaring a lot more and I don't know why. I even put a background on the tank so he couldn't see his reflection in the black filter that hangs on the back. I notice it more in the later hours. What could this possibly be?
He also has a slit in the caudal fin. Is it possible it could be from the intake tube on the filter? I noticed that whenever he swan by it, he had to kind of struggle to get away and his fin stuck to it. I recently put a mesh bag over it but I don't know if this is going to do anything. I haven't really seen him go back over there. There is a plant that could be the problem but I've seen it in other people's tanks. It's harder than the other plants but the edges seem fine. What should I do?