I've been separating the sexes when they get to be about half grown. Well that's not quite right... when the females are about 1/3 grown they go back in the female tank. The males I leave until they are about 1/2 grown as the older males are way more active and do a bit of chasing of newly introduced young males. So far I've seen no sign of "interest" in the fry tank. Please tell me what I want to hear....that the size at which I've been separating should prevent future pregnancies.

Actually, come to think of it, at what age/size does a fry become a fish ie. when do you stop calling them fry?