I would strongly suggest getting a pair of fish to breed rather than a group. Some sites sell these pairs so that you know you have a male and female. I can give you the URL if you email me at justin@infernowebdesign.com of a place I know of that is reputable.
Also, breeding isn't as easy as it appears. You need to have special small brine babies to feed the newborn fish and need to move them to a separate tank with all of the sides painted black with the only light at the top.
Just read up on it first so your prepared to spend the time and money it takes to SUCESSFULLY breed the fish. I'd be interested in knowing if you have any luck.
