I have a group I raised from tadpoles about a year ago. I keep them in a tall tank with about 3" of water at the bottom, wood, and plants growing hydroponically. This has worked great and they call EVERY night starting at about a month out of the water. Lucky the call isn't loud and I can sleep through it as the tank is right next to my bed. I haven't noticed any breeding yet, but I'm doing anything to encourage it either. Enough food to keep them healthy, but not enough for them to get fat and looking to breed.