I have three of some kind of spotted corys (can't tell what they are yet) in a 5 gallon tank with a betta. The fish all do well together, but the corys are very nervous all the time. They are quite active when I'm not moving, but anytime I move around the room or open the cover for feeding they start flying around and then stop and sit on the bottom. Once they stop moving their color fades, so I think they're probably spooked. I put a log thing into the tank which helped calm them down a little, but I was wondering if there is anything else I can do to get them to calm down.
There is a picture of the tank here.
There is a picture of the tank here.