Breeding Comets

[Masa06]

Well I wanna start small and I have a few small comets in a tank... They were bought as feeders and I was wondering when they will be sexually active and on how to determine their sex.Also any triggers to have them breed helps .Any information helps Thank You.
I know guppies are easier and I plan to do them aswell

 

[g11king]

I would also like to know this?! I have a few comets some at 9" and never had eggs etc!

 

[BODYDUB]

I believe that comets would have to get quite big in order for them to breed, but I may be wrong..........