I have a pair. Female is almost 3 and a half in long. She can be somewhat aggressive in guarding her spot but not anything at any other fish. She has been aggressive toward my rbta, she is not happy where rose settled and has been bumping and making rose move around to where she wants, where ever that ends up being. Hopefully rose doesn't get to messed up. So far been lucky. I like my clowns. Have had tomatos, percs, and marroons. I would say the females always have an attitude.