I have seen a staff member, take fish from 2 seperate tanks and put them in the same plastic bag, which surprised me. When we got to the counter, he was taken aside by a senior staffer who realised what he'd done and told them off basically, but I overheard. But then they let it slide anyway. I said "no thanks, i don't want the fish now". No oxygen or stresszyme was added to the bag either, even they knew I had an hours travelling to get the fish home.