Ah, I see. I saw the full tank shots and it looked like sand to me, but I see it is more of a fine gravel when I looked at the salamander close ups.
Have you achieved breeding or courtship behavior with this species since 2012? Is their new tank indoors or outdoors now? Do you know how many males and females you have? Sorry for all the questions, I just find this species very fascinating and would like to have a go at breeding them myself someday.
Also, I have had no luck finding the article you spoke of on the internet. Is it only in the AG Urodela Magazine?
Thanks! -Seth