Hi there, does LPS stand for PET SMART? I'm from the UK so don't have personal experience with them, but all I hear on the forum is bad thing about them
Anyway, I have 8 dwarf neon rainbows and bought them from a shop I trust very much. The guy I deal with is in the process of writing a thesis on fish and he really knows what he's talking about. Anyway, when I got mine I asked the same male/female question, and he told me that you should get more females than males as if they decide to breed it will reduce the stress on the females, more to share the burden.
Pet Smart were correct in saying that the males will vye for attention, but I think you should have more females really. I have a ratio of 5 to 3 in favour of females.