I have a 20 gallon long aquarium that I set up for 4 firebelly toads. I used plexy glass and made it 60/40 water to land. I bought a rock filter that doubles as a waterfall. I have about 8 inches of water in there with some large rocks that they can climb on. They love the water area and they are really good swimmers. I find at least one of them hiding under the water in between the rocks. I've found that you can use a lot of stuff they make to house turtles with.