You can just upgrade the hides to something like bigger flower pot holders that have holes in them, or you can do that as well as upgrading to a 32qt-41qt tub. If you put him in a bigger display tank just make sure you give him plenty of appropriate hides so he can always retreat and feel safe. To give him more floor space, while still giving him hiding spots in the same tank you can always get 2 large flower pot holders and cut holes in the sides, then cut a piece of plexiglass the size of the bottom of them, glue it to the bottom of one and stack them. The top will be cooler than the bottom one, they will be the same, and they will only take up the space of one larger hide to give him more floor space.