WARNING! Dont let any of your precious corals ever accidentally touch any toadstools!! I have a very nice acan baby and it fell onto my rather large toadstool for just a couple hours and i lost two mouths! I know that most know about this but i am putting out an all alarm out for new reefers. Be Careful, even if it is an accident. Or u'll wind up in my shoes()
I would think most any corals in direct contact with another would suffer from chemical warfare of some sort.