I'm not sure, but I think the water level is about 10 inches or so deep. No, they aren't the best swimmers but they can make quick frantic dashes when they need to. Musk Turtles prefer to walk along the bottom. They are really good at climbing and love to explore rocks and driftwood for food. He has a basking area, but he never comes out of the water. He loves his little cave, it's his safe zone!
When I said exotic, I was talking about all the non-native turtle species you seem to come across, like that leaf turtle and the Asian box turtle.