My lfs guy is a hoot and quite knowledgeable. His famous phrase after purchasing a sw fish is "I guarantee it is alive when you walk out this door..." He doesn't have any guarantees on saltwater fish, but once he gets to know you well he will work with you.
I have a large golden tail moray eel and I was introducing a LARGE wrasse a few weeks back. That poor thing was not in the tank for more than 30 seconds when Morty (eel) came up, sniffed him and hauled his butt back behind the rocks and downed him head first. I was in total shock!! <img src="graemlins//eek.gif" border="0" alt="[eek]" /> I called my lfs guy and told him what happened and he is going to replace the wrasse with something bigger and meaner...no charge. Maybe a clown trigger that Morty won't mess with <img src="graemlins//yeahright.gif" border="0" alt="[yeahright]" />