I had no problem with breeding danios - the problem was they would never stop!
I never saw any eggs, but when it came to water changes, the bucket of dirty water would be full of fry.
The ones I left in the tank would never survive even though the tank was densely planted, so I set up another tank for them and did raise a number of fry to being fully grown adults.
It's a really nice feeling to watch them grow and develop.
