females are fine, a pair is fine, a male and two females are fine, just be ready for babies if you go with a male and female(s) (obviously). I know Hedy has them co-habitated but a buddy of mine keeps them in individual enclosures.
This is my favorite that I've seen so far.
This one is pretty hot too.
green ones are pretty rare, and IMO one of the better looking garden phase colors
There's also a leucistic floating around, head looks like an alien.