It probably depends on the cause of the crash (temperature spike? Ammonia/Nitrite/Nitrate spike? Chemical contamination? Low Oxygen due to loss of powerheads? etc.) and also the hardiness of the inhabitants.
But in general, I would expect it to go corals, fish then inverts like crabs, etc. But a tough coral might survive when a delicate fish doesn't. Sometimes snails seem sensitive, but other times they might be the only survivors.