I've got a pair of spare 2.5 gallon terrariums. Would there be a gecko suited to such a small vessel? I've currently got a fern and some little random rainforesty plants in there, which oddly enough are doing well together.

Or should I just turn it into a little fish tank? I don't want to put anything in the tank that won't be happy. I have screen, perforated metal, and glass tops for this terrarium, and it's counterpart, if that helps.