Frog species have different kinds of toxin in their skin. Even though captive raised darts don't have toxins that can affect humans, there's still a chance they could harm other frog species, or other species could have unfamiliar toxins that harm them. From everything I've heard from experienced froggers, keeping two different species in a tank is asking for trouble.
Also I don't think anyone's mentioned yet that darts/mantillas species are awake during the day while tree frogs are nocturnal. (My white's are awake in the early evening so I do get to see them a lot though.)





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but you gotta do a reseach and of course if you have qs you are welcome to ask.
