I think it was determined that there was something going on with your tank though right? There was alot of shifting around between tanks, rapid salinity decrease (even for hypo), and overcrowding. DOA's can happen to anyone, as carefully as your package is labeled for live animals, there are still plenty of minimum wage freight handlers that may not care if you receive them alive or not. That can happen to any package, it happens when the LFS's receive their shipments as well. It is simply a side effect of transporting animals.