Danios. Zebra, leopard, celestial pearl. All are easy to breed.
All you need is two 10 gallon tanks, one with marbles on the bottom (two layers). Put the females in the tank with the marbles. The females are the ones with bigger bellies.
Don't know if one is a female? Then keep it with the males for now. Feed them blood worms and other good foods for 3 days.
Make a breeding mop for the parents. It's just yard wrapped around a book several times then cut it in half at one end, take it off, and tie a knot in the other end. Solid gold, I think, on youtube has a video as to how to make one.
It doesn't have to float but it can if you want it to. Then, one night before you to to sleep, do a 90% water change on the female's tank then move the males to it. In the morning, if you're lucky, you'll wake up right at the crack of dawn and see the fish breeding.
After a few hours remove the parents. When the eggs hatch just start up a brine shrimp hatchery (it's not hard) and have the food ready for when the fry are free swimming. Feed them 2-3 times a day.
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