Seems like our turtles have adopted these fishes as their own pets. My turts' tank has about 20 fishes or so, minnow and guppy alike. When I give into temptation and buy new fishes, my turtles always eat the NEW ones! How do they know...

I think it's something to do with territory... eat the new ones and leave the old ones alone.
Anyway, yeah, guppy fry mature pretty quickly and can take care of themselves in no time. I don't feed them much cos most of the fry learn how to eat the residue of anacharis.

Monday is an awful way to spend 1/7th of your life.