Sorry, I can't help you. I've never kept them. If you read the article I linked, you know as much about salamanders as I do. I only suggested them because you asked about other amphibians.
That said, I will keep them in mind if I decide to add a display animal. I've always thought if I decided to go with a bioactive display animal that I would go with dart frogs, but the care for salamanders seems a better fit for me. I'd much rather deal with feeder worms than fruit flies.