Here is the response from Instant Ocean
Hello,
Wow, we are sorry to hear this happened! Besides the water change, yes, carbon will help remove it. However, it actually leaves the system within a matter of about 3-4 minutes, and no longer has any affect, so any other loss may be due to the initial effects eventually taking their toll.
ML
I have never used this before and had gotten it from the swaps in the bag and thought can't hurt. I dosed and the set the bottle down and when I turned it have fallen into my sump, so helpless trying scoop it out haha. The carnage and mayhem was massage. I think that it took something out and caused the poison to spreed lost all hard corals, both rbta, most snails, urchin but the live stock still looking good.
When people say that good things take a long time in this hobby and bad things happen fast, I didn't think a total loss in 2 days....