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You might want to check out arboreal rainforest day geckos. You could ask this on phelsumaweb.com. I have heard some people keep day geckos with frogs.
Rhacodactylus trachyrhychos geckos tend to like water and could handle water that deep. They are the most water-tolerant geckos of any that I've ever heard of. Good luck getting your hands on some of them though. One will still run you about $750 plus.