Shellfish is the worst, however. Clams of any type will go rank so fast that the cleanup crew can't get it done.
There's a reason why buying clams/mussels for eating at the market requires them to be alive before you cook them.
Steve, sorry to hear about your loss. I had a semi-major snowstorm in my tank this week-end as well. I finally fixed my MRC Nilsen reactor, but forgot to plug in the timer that cuts it off 6 hours before dosing, so my dosing was basically a white paste instead of saturated water. Did a 30% water change this morning and will do another tomorrow evening. No deaths yet, but some partial tissue losses on one acro.