All corals closed after addition of zoo frag.

[michika]

I'm thinking that there might be more factors then just the addition of the zoos.

1) Test the water, do tests before and after a big water change.
2) As gross as it is, are there any marks, open wounds, etc. on the perc? How fast did it happen?
3) Start keeping a log of your tank. Use a notebook or an excel sheet. Keep track of at least the following: date, time in day, temp SG, pH, Nitrite, Nitrate, Ammonia. Make a note everytime to add something so you can track its impact on your system.

I'm really sorry about your system!