I only have one, but I highly recommend them--truly beautiful fish and a great member of a community tank (if you have a community tank). And unlike some fish, its beauty increases with maturity and as it grows in size. So good choice!
I have heard the same 2:1 female:male ratio as well, but I have no personal experience.
And yes, how large is your tank? My fish is not particularly active--he mostly hangs out or swims around verrrrrry slowly unless it's feeding time--but he got BIG!