I am looking at Zebra Danios (as well as other species for a species only tank, but I want to learn a lot about each species) to keep them in a 20 gallon long. I want to know if they will breed on their own in the main tank without my influence. I will be feeding them live food + flakes, frozen brineshrimp, Hikari tropical ones etc. Like is their anything specific that makes them breed or will they breed on their own easily.