CoralineCori;
Sorry to hear about the problems.
I have used the excital with good results but every tank is different and reacts differently to any new chemical or addition we add.
Your Goniopora is very delicate and it's demise could very well be the addition of the Excital.
Your calcium is high but you say you changed salts. Did you mix the salt in the bucket before you took any out for a water change?
Your hard corals seem to doing fine but your food coral (zenia, Gonipora ) are suffering. Try feeding your tank ie phytoplankton or zooplankton, coral vit etc and monitor those coral reactions. Excital might have stripped the water of one or more of these.
Kevin
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