I wouldn't house the newts with anything but another newt. Even then, you have to keep the tank clean because the toxins can build up and be harmful to each other. Yes, they are just as toxic in captivity. Their toxins are built in, as opposed to aquired from food as with darts.
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I think my frog owns a megaphone....

White's tree frogs : 1:1
Mantella viridis : 1:3

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