How old is it and what kind of husbandry are you using? Trembling or muscle fasiculations in geckos can be a sign of several serious metabolic diseases. Once they are trembling they are likely past the help of home care and will need veterinary help. I would try to get it to an exotics vet ASAP. If that is not an option, assist feeding and watering, herptivite, and praying may work.

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