Hatchlings measure 3 to 4 inches long. Adult females are typically 7 to 8 inches, and males are 8 to 10 inches. Some males of the giant bloodlines reach nearly a foot.
A 10- to 20-gallon aquarium houses one or two leopard geckos from hatchling to adult size. Larger tanks tend to cause the geckos to stray away from their proper heat and hide box. Although visibility is reduced, many people use plastic storage boxes as housing. Any cage you choose should be at least 1 foot tall. Be sure to have a secure screen top on your gecko cage that will support a light fixture, provide good ventilation and keep out bothersome cats. A hide box filled with moist moss or vermiculite is needed, so your leopard gecko can shed its skin properly. This secure setting also is needed for egg laying if you plan on breeding geckos. Live or artificial plants can be added for a nice decorative touch.