This is a 5 gallon tank with 3 platies (1m2f) and 2 male guppies. It isn't a surprise when I see the guppies try to chase female platies and mate with them. I think this cross breeding won't work out anyway. It is the guppies trying to mate the male platy that really blows my mind. It is so funny that they don't know a fish of that size could actually be a male. Lol~