i put black posterboard behind the tank as a background and it looked really nice... but my betta just flares at it continuously. i think he can see his reflection in the glass when the posters there. would this same problem occur if i painted it? any thoughts?
I have my Betta's next to each other or have a mirror next to them so they can flare and get their exercise 14 hours a day 7 days a week. I don't understand why you wouldn't want to watch him flare. If they get tired of flaring at the guy on the right they can turn around and flare at the guy on the left. They don't get "overstressed" or "rip their fins" like some people say. I keep and breed Betta's for their beauty and the joy of watching them flare so I don't see the problem.