There are other fish, crabs, shrimp, snails. The only toxin would maybe be from a bug getting in the tank (the pest control guy came last week, but I walk around with him to make sure he doesn't spray near the tank. I wonder if a bug that had come in contact with the poison, and then got in the tank, if that would have enough toxin on it to hurt? And why not all the fish? I had him a couple weeks, and he seemed fine, so I moved him to the dt. After I moved him, he did get what looked to be a few spots of ich, but it went away pretty quick. At least I couldn't see any spots anymore. He only had a few spots of it, and it lasted maybe a week... he always ate well, never acted strange. Until the last 24 hours.
Edit: 3 clowns, flame angel, pink spot shrimp goby, 2 naso tangs, 2 sargassm triggers, 4 anthias, dwarf lion, 1 wrasse (now), 3 emerald crabs, 2 cleaner shrimp, bunch of snails.