I just bought 3 Giant Danios last week one day, and I now have a 55 Gallon
tank FULL of little bitty pin shaped babies. They are the only fish in there. So I would say the babies are theirs. I also caught the bigguns out and they are temporarily relocated to an unused 10 gallon that I had set up.
The fish had to lay eggs and hatch within a week of being put in my tank!!!!!
TOTALLY AWESOME !!!! My first hatch of non livebearing fish!!!