Can Hermit Crabs And A Leopard Gecko Live In The Same Tank?

No for one big reason one needs 70-80%humidity which is the crab and the leopard gecko needs 40-60% humidity the crabs need it to breath if the gecko gets to much humidity for to long it will cause it to get a respiratory infection so absolutely no but if you want a hermit cab and a lizard you could try anoles with a coconut fiber substrate I'm thinking about trying it in my large viv but make sure its a a really tall cage so the anoles will stay up top and the crabs will stay near the bottom

No mate

No they will fight

I would NOT recommend putting those two together. Animals with the same natural environmental conditions can sometimes be housed in the same tank. However, often times, many species can form territorial behaviors and/or pick on and possibly eat/kill each other. For instance, putting some species of crab in with your fish. Even though both will thrive because they come from the same environment, the crab may feed on your fish (happened to me!).