All corals closed after addition of zoo frag.

[Murminator]

Just a little update he PMed me this morning say everthing was still closed up except the zoos and his fish were dead not sure how many it was. I thought that I have had enough experience with zoos that the would never kill fish maybe I'm wrong.
I think most people in Edmonton have seen the rock of zoos I'm talking about it has made it to a couple of frag parties were I would butcher it up and take it back home and throw back in my 20gal with no problems.
I just wanna know if anyone else has had similar problems cause I feel real bad if the zoos contributed to the death of his fish. I never would have thought it would be an issue, they have just been moved from my 90 to a 29g holding last week when i posted them. I suggested to him a big water change like 50%. His tank isn't very old i wonder if it was too much at once the rock have to have at least 150 big polyps.
Any idears???