puntific, sorry to hear about your lose. I think LFS should be responsible enought to question someone regarding the setup before selling them a animal. Such as how long has your system been setup, what is you chemistry, what kind of lighting do you have, etc. etc. Some LFS are in it JUST for the money, no regards to the animals they are selling and that is sad. I wouldn't sell someone a Ultra maxima if I knew they had only NO lights or if they had a fish in there system that they knew had a reputation of nipping at clams.
Also as a buyer, when I buy something I ask about there system as well.
I guess I am from the old school, I accimate everything. If I know a clam is being shipped more than 24 hrs or if the person that is selling me the clam and has had it under VHO, I am not going to throw it in my tank under 400watt MH. Not only do I accimate to water chemistry, also temperature and lighting as well. I might have to shield the clam if he isn't use to my lights for a time period but I would rather do that then to lost a animal.
We have ALL made mistakes but we do learn from them. I have made a few myself, if if someone tell me that they have been in saltwater reef and have never lost anything, I would tell them they are lying...