This is some really good advice! I'll keep it in mind for later when I have more space (I plan on moving some time within the next year or two. It really depends on a number of factors outside my control). I need to upgrade my turtle's setup first, so I'm hoping the turtle's 40 gallon tank can tide Kuma over until the move.

And I wouldn't say Kuma is paralyzed. The knee and muscles required to extend her left hind leg are competently destroyed, but she can still pull the leg closer to her body. It greatly impacts her swimming ability, but I'm not sure to what extent yet since her water area is so small. She can still jump around when she wants to, as demonstrated last time I cleaned her tank (I had to take out her flower pot hiding place because it was starting to mold, so I had to move her to the angry bucket while I worked. She hasn't forgiven me yet). Kuma was flying around the aquarium, but I don't think her knee twisted once!

I think it's time to remove the bedding and make it a mostly aquatic environment. I am really happy I saved all my old equipment from when I was a kid, or this would be expensive. Since she's only two inches long (not counting her good leg), I'm thinking of making the water 2 inches deep with gravel substrate and a filter (wrapped in window screening to keep her leg from getting sucked in). And some rocks to perch on, hiding places, and a land area.