Published on Saturday, May 9, 2009 by admin Hermit Crab Cage Hermit crabs do well in cages that have bars so they can climb for exercise. One that has a plastic bottom tray but bar sides will be perfect for your crab. Some people like to use fish tanks, which work just as well. You can use rocks in the bottom, but we like the special sand made especially for hermit crabs. You can get a variety of colors, i...