I bought a male guppy at a local pet store and noticed that in one of the female tanks, they had babies, so i asked if i could buy the babies. i have a 5 year old and thought it would be neat to watch them grow. Anyway, they gave me 4 fry. 3 of them are still alive, and TINY!!! I think one is about 2-3 weeks old and the other 2 i think are about 5-7 days old. They are all almost translucent except for their eyes. When can i tell what color they will be and what gender?