Yeah bit disappointing to hear. I've met the manager several times and she is a knowledgeable woman as are many of the staff I have spoken to there.
And to be honest, fish die in commercial set ups sometimes. Not a lot you can do, other than remove them, quarantine as necessary and move forward. A huge amount of work goes into running a business like that, and no doubt they are always after fresh ideas, sometimes you just need the right person pushing through the correct information, and providing that knowledge to other staff. And then again, sometimes there are reasons behind the way things are done commercially rather than in-home..
I think you got given a lot of great advice on here regarding your options, perhaps none of them are suitable for your current standards of work? We were always taught to start where you can and make the necessary changes towards your goals. Sometimes it's jsut about a bit of experience? And see how it goes.
Good luck with the search