What is the final result in the epoxy based rockwork used in zoos and aquariums? Certain US brands have been used for decades in sensitive and closed coral reef systems, as well as the leading dart frog and amphibian conservation programs in the world. I guess what I'm asking is what is the threat level of mixed and cured epoxy over foam in a contained environment? It would seem that captive amphibians and invertibrates have yet to show any noticable side effects from being housed in epoxy based housing using products from "major zoo suppliers".I'm not going to say names on an open forum. But with extensive searching I have yet to find a US manufacturer that makes a nonylphenol-free epoxy clay.