My Mystery snails have started breeding.... I didn't change the water temp at all... well, the power went out and it got a little cold, then warm again... but that's all. LOL
Also, the Malaysian Trumpet snails are live bearers, and they'll breed to what your tank needs without breeding you out of your home.
I breed feeder guppies and all you need to do is have a ratio of like 3 f: 1 m and they'll take off.