At What Age....

moscow's you can sex from 2-3 weeks by the colour, but most other will develop colour from 4-6 weeks and devlop a gonopodium from 6-8 weeks of age
 
if they wont fit in the largest fishes mouth then they will be ok.
 
it all depends on the othe fish, if your worries thay will fit in the mouth of another fish then no as all fish love to eat baby fish.
 

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