A leopard gecko would do well in a glass type aquarium. Be sure it is well ventilated with a screen, or other form of open air flow top. Be sure to add plants, etc. to make it homey.
A plastic or glass 10 to 20 gallon tank should be about right for a single leopard gecko. If you plan on keeping multiple geckos plan on at least 10 inches by 10 inches each.
A leopard Gecko needs at least a 55 gallon tank roam and exercise its legs. You also want to replicate his natural habitat within his aquarium which requires much need space.