Thanks guys. I guess I either run the risk, and get a small male platy group. Or get a small male & female platy group, to reduce the breeding; not sure what I would do with a load of baby platys! I will have angels in there, so I could let nature work and leave them to survive on their own. Survival of the fittest and all that... Would feed my angels and I would have a hardy platy population! But this is a little cruel, and I'm not that sort of person!
Anyways, cheers guys! See yaa