I have a female betta that is about 2-3 months old in my tank, and I have recently added a green Cory. The two get along great so far, no biting or flaring from the betta, and the cory seems to like her. I'm a bit concerned though because since my betta likes to swim "laps" around the tank when she gets bored, almost every time she goes past my cory it swims up and bumps into her (he usually sits on the bottom or on one of the decorations) they take turns following the other around the tank for a while, and it almost looks like they are playing tag. The betta is very non aggressive and is very friendly, so I'm not worried about either party being stressed by this, and they seem to enjoy it. I was just wondering if this is normal Behavior for a Cory or if it's a unique thing that only mine does? I very much doubt that it's a parasite because he never rubs on anything, and he came from a very trusted source that quarantined and treats fish they take in.