Put them in pots and use Eco Earth for the potting soil. Make sure you use a drainage tray. You can keep aloe and other succulents, and if the gecko actually makes it up to the plant they'll just sit on them. They can't dig them out if the pot is roughly the same size as the plant. If you use the Eco Earth, if they decide to eat some of it for whatever reason, it'll pass right on through.