I have had both, currently have a Brown. The Blue I gave to a fellow reefer with larger fish. The Blue was in my 215 and I really thought that tank was too small, it constantly was swimming the length of the tank frantically all day long and was a nasty SOB. He did eat everything and they are absolutely beautiful, never had a problem with ick. The Brown I have now is much more mellow, not nearly as aggressive, eats anything and no problems with ick.