If I were you I wouldn't put anything in with a gecko. Well... you could put a cricket in but it would get eaten. Geckomaster You could put an anole in the tank; they'd get along just fine. I've seen it done before.
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Geckos are solitary creatures and very territorial. Most gecko species do not live in colony's or groups what so ever. A female will only ever see a male when it comes to breeding season. Males will only interact with same species during the same period. Animals of different regions cannot be housed together. For example: A crested gecko requires temperatures that range from 68-80F with humidity levels reaching 90% for up to 4 hours daily. They receive approx 10-12 hours of sunlight each day and need a nightly misting each and every day. The crested gecko is also an omnivorous species and they rely on a meal replacement powder as a main source of food. The Leopard gecko enjoys a hot basking spot up to 102F with 0 humidity. They require a standing bowl of water in preference to a nightly misting and are insectivores relying on live feeders as a stable source of food. These two animals come from completely different parts of the world with different requirements and care. A crested gecko wouldn't last longer than 24hours in a leopard gecko environment and the same goes for the leopard gecko.