Which contradicts the info I just got at the reptile show. I guess if I could warm their tank up to 70F, then I'd be following both of their advice. Conflicting advice is quite a problem for me, especially when dealing with a less commonly kept critter.

BTW, the type of heater I got for the salamanders is a type meant be kept inside a terrarium. It's called humidaheat. When I was reading the directions, I figured out that the substrate needs to be in layers and it needs to be placed partly into some kind of specialized clay based substrate to draw out water at the bottom.
So I ordered some of that specialized clay substrate for the humidaheat heater. I also have a so called dimmable heating lamp on order, but it was supposed to be for the geckos.

It's ironic that I wanted to avoid heating terrariums so I choose species that would thrive in more temperate climates and now I'm finding it's even more difficult to do a low heat terrarium then a typical tropical one as there's less margin for error.