I had two girls already when I decided to start a Sorority, and they were not only huge compared to the other girls, but one, Sini, had already proved herself to be a really aggressive female, which made me really anxious! However, when I put them all together, Sini ended up third or fourth down in the order without much fighting, and Tweak, my lovely red who is a full two inches long and has a minor swim bladder defect that causes her to swim sideways/upsidedown/very weirdly quite often, ended up as queen~! So as far as size goes, I say it certainly depends on the individual :]