I recetnly adopted a rough skinned newt and two firebelly toads that came in a very large aquatic/terrestrial tank with lots of foliage, rocks, and a waterfall. I would like to get a crested gecko to go in the tank as well because the terrestrial area is unused by the newt and frogs (they like to stay in/near the water). I was told by the petco guy that the gecko could go in the same tank but after doing some research, I have found that the newt is extremely poisonous (via ingestion, but skin contact may induce a reaction in some cases).

So, can anyone tell me if I can have a crested gecko in the same tank as firebelly toads and a rough skinned newt? If not, is there any other creature that will be okay with the frogs and newt?

Thanks, Niocle