Cool perspective. Do you release some of the salamanders into the wild once they're strong enough as to not overpopulate your exhibit? Also, do salamanders act autonomously in the exhibit or generally stick together by family or other grouping? I had two I found growing up that I built a terrarium for... and they promptly escaped overnight (magically through glass) to never be seen again. Childhood issues.... haha.
Right now they are breeding at a manageable rate. If they breed too quickly and lay too many eggs, we may try to offer them to other facilities or, if no other choice, simply freeze the eggs as soon as they are laid before they develop. Unfortunately, being born in captivity means that they cannot be released into the wild.
Most salamanders are loners. They may live in the same general area if conditions are right, but they really don't interact much outside of breeding. They can actually get pretty nasty toward each other, especially when guarding their eggs.
Yeah, salamanders are incredible escape artists. We have a tight seal on out exhibit because they will squeeze out even through impossibly small holes. Even hellbenders (giant salamanders up to two feet) are a hassle to keep in zoos as they can escape all to easily!
You've taught me about nature and also exonerated me from the guilt of those little guys escaping. Win win. Thanks for the lesson.