I think I made a mistake of only buying 2 balloon mollies. There is a larger one (silver) and a smaller one (orange). The silver one will try to nip the orange one, and will chase it around. The orange one seems very timid because of this. When I feed them, the silver one bullies the orange one so I have to give extra for the orange one after the silver one is done.

They are in a 10 gallon (one inch each so far, well the silver on is like 1.3 inches and the orange one is 1.0 inches, something like that but the silver one is definetly bigger.)