We went through this question in 09 with "tasteslikechicken"--thread lasted 16 *#[email protected]
Do not try this--it will not work.
I usually am taken aback by the many "veterans" who pounce on young people who don't know better; there was time when many of us were innocent and did not know. That said, I must be honest, you are trying our patience. It is as if you have your heart set on something, and are looking for someone, anyone, to approve of your desire. "But I like these two species, and want to find a way to mix them." Well, I like gouramis and chinchillas, see where I'm going? So be it...
Crested geckos (now Correlophus) come from New Caledonia. No amphibians, they did not co-evolve with amphibians. What makes you think the crested needs (or wants) company? The previous poster is right--with that big head they will grab first. Also, they do not want or need the high humidity needed for most dart tanks. Have you ever seen a book on Rhacodactylus that says it is okay to mix them? No, you have not. So why are you asking here?!?
You have not answered Dendroguy's question: Why not get more auratus?
MantisDragon and I have both had success with multi-species exhibits, but we don't play games with Rhacodactylus or dendrobatids. Do your homework, learn how to grow the plants, and we'll be happy to show you some combos that work. First rule, they should be always species that come from the same climate in the same part of the world. That said, even these combinations are by no means risk-free
North American hylids with green anoles
Western green toads with canyon tree frogs
Reed frogs with small phelsuma
Madagascar reed frogs with certain mantellas
Asian rhacophorines with Phelsuma or Acanthosaura
Litoria with Lophognathus
and if you actually know what you're doing:
(some) dendrobatids with (some) neotropical hylids
I have even seen zoos keep Cuora with Physignathus cocincinus
--in a huge enclosure, but you knew that...
But if you're going to ask, "Why reed frogs but not dart frogs?" or "Why flying geckos but not crested geckos?" This just shows you do not know quite enough about the animals to attempt this kind of project. For example, I keep hylids and rhacophorids that sometimes bask--they can tolerate more heat than any dendrobatid. Ed is a professional, and he has posted guidelines on mixed/multi-species exhibits, with contributions from other DB veterans. I suggest you read it, and study up on the concepts.
Now, please don't ask us if you can keep a bearded dragon with your axolotl