Emerald crab question

[Samw]

OK, I just read that thread. My opinion is that there is no way an emerald crab in his photo could take down and kill a healthy tang. That fish was sick and the crabs took advantage of that. Fish will usually die at night anyways. That is when CO2 is at its highest and O2 is at its lowest. When I kept freshwater fish and a fish would die, I usually found them dead in the morning. Now, was there a chance that tang could have recovered if there were no crabs? Possibly, but who knows.