When I had both Xenopus and African Dwarf frogs, they were in a 25 gallon aquarium setup-the first by themselves, and the Dwarf frogs in a community tank setup. No land at all. Xenopus had no gravel or other substrate, and my Dwarfs had natural aquarium gravel. Both of these types of frogs can dry out very quickly if brought out onto land, and they do not move well either. Their little (or not so little) froggie legs are meant to swim, not hop or walk like other species.