I had a 55 back when I was in high school that had oregon newts, fire belly newts, tree frogs, and fire belly toads . If you set it up right at night they will sing for you .It's pretty cool but if you are a light sleeper it will drive you crazy .I was able to sucessfully breed those and the tree frogs in my viv .I set it up so it was half land and half water. with live plants and all. They ended up living for 7 years in their . If you set it up right you can mix a few other species in their also .