Having managed a Petco for a good year and a half...this just really makes me sad. One of the prime focuses for people when I was there was knowledge, and I'm proud to say that pretty much all the people we had working there could have answered just about any question you might have had, and were not the type to just sell living creatures without finding out if they were going to a good home. Of course, when I go back in there, things have changed a lot from that perspective, so it doesn't surprise me that the Oshkosh store has gone downhill as well.
I'll have to scope it out and see who the management is there. One of the assistants at the time was a big force in getting us to change our fish supplier, since the one we had before was about the worst I've seen.