That's partly why I posted this. I hadn't heard of anybody attempting that, so one of my main questions was whether or not this was a harem. It sure looks like it, but it could be possible there's males that are subdominant and not colored up yet. I initially thought there were two different species, but if it's all the same, whether there were additional males or not, I would still only want to put one in my display tank. Traded 3 nice looking fish essentially for one.
What I'll probably do is get a bigger quarantine tank (obviously) and keep the four in that don't move to the display, and see if I get any other males out of the four silver fish. Then trade away the harem if one develops, or just individual fish, utlimately only keeping one.