I have one female and some very fancy tailed danios - the little female regularly lays eggs in the tank (approx every 6/8 weeks it seems).
As soon as she's finished all the mates in the tank gobble up this free food supply. I have never yet seen any young.
ps - I've had the pleasure of these manic swimmers now for nearly 2 years and there is no sign of her slowing down on the old spawning front - at least it keeps the males happy!