There actually doesn't have to be 2 females to every male in order for them to mate by the way. The reason for a harem is that males will literally mate females into exhaustion and death so by having more females than males the activity gets spread out among various females but 1:1 will still mate and produce off spring. Also, personally I try to keep a 5:1 ratio of females to males.
Oh, and it looks like a Mickey Mouse Platy to me.