I have set up my 29 Gal. aquarium on 12/21/10. About 5 days later I had added 4 Clown Mollies to the tank. The first day they seemed to swim all over the place. A Day ago, I decided to add 5 red tetras to the tank. They seem fine. Swimming really good. Staying together, no problems. The Clown Mollies: 1 is swimming like he's on speed, and the other 3 are on the bottom, hiding and not moving, unless I feed them. Should I be concerned about this? Should I do a 10-20% water change to the tank? I don't know my parameters of the tank. Any help would be greatly appreciated.