So, our 3 hermit crabs are currently housed in a 20g tank. It was looking a little empty so I ordered a nice piece of cholla wood online for them and just put it in the tank. It doesn't have much in it because I want them to have room to move. I feel like a 20g just isn't spacious enough. We have had them for about 2 1/2 years now and I have no idea how old they were when my husband rescued them (there was a guy behind the building he worked in who was throwing a critter keeper with the hermit crabs in it in the dumpster).
When our bearded dragon grows some more (he is only 3 months old right now) and he moves into a 75g, the hermit crabs will be moved into the 40g the bearded dragon is currently in. This will give them more space both horizontally and vertically.
