From Lianne McLeod, DVM,
Your Guide to Exotic Pets.
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Fire bellied newts and fire bellied toads seem pretty similar in their care, but can they live together in the same tank?

A. Though it is sometimes tempting to mix species when their care seems similar, I generally do not recommend combining different species of amphibians in the same tank or vivarium. In the specific case of fire bellied toads and fire bellied newts, there are several reasons why this could be a bad idea:

• The biggest problem is the appetite of the fire bellied toad. They are fairly aggressive eaters and many will not hesitate to try to make a meal of a fire bellied newt. Newts have been injured (often lost limbs) or killed by fire bellied toads. Even if the fire bellied toads don't go after the newts, the newts are bound to be stressed by the presence of a potential predator in the same tank.
• Skin toxins: both fire bellied newts and fire bellied toads can secrete skin toxins. It is thought that the toxins are different and distinct and they could potentially affect each other.

For more reasons why mixing species can be a bad idea, see Can I Mix Species When Setting up a Terrarium?