I must admit I don't have one of my own yet but have read several books and articles on them so when one does come up for sale I can just buy it straight away. I do have a horned frog, though and the care is relitively similar but it's just a smaller frog. It's starting to dry abit on top but aslong as it doesn't completely dry it should be fine. There's also the option of a heat mat underneath, they don't dry the substrate out too much however they dry the bottom of the tank so have to watch out for that but they're better for frogs in my experience than heat lights but you'd need to use with a thermostat, otherwise they can easily get too hot for a burrowing frog. Consider creating a bigger water area, some do a 50/50 land and water. A plastic container covering half the floor would be good. Just for 20 mins or so and just so it doesn't cover the nostrils of the frog