Awesome frog, These guys are quickly becoming my favorite. I have owned two for the past 5-6 months and really enjoy watching them. Couple things that I have noticed.
1. When they are younger they tend to sleep above the water on tree branches or the side of the cage. As they get older maybe 2-3 months they will start to sleep during the day with only their nose out of the water. At night they explore my whole 35 gallon hex, so some height to the cage would work best.
2. Mine really love the moss that I put in the tank, They almost always are sleeping on the edge of the moss and the water.
3. They wiggle their toes to attract food, looks really strange.
If you need any other advice or observations just let me know.