Apparently, the talk that I had with the staff the last time I was in the bad Petco had an impact!
I found one male with ammonia burns, but cups were clean, and everyone else looked okay.
My only concerns with that store now are the staff in general, but I think that's a product of the location. It took me 5 minutes to find an employee, and then, when I said, "I found a fish with ammonia burns," she said, "No, they have fin rot and they're being treated."
I held up the cup and said, "Uh, no, he has ammonia burns." (Can you hear the eye roll through the Internet?)
She was like, "Oh, you mean a betta!"
Well, yeah. Bettas were fish, last time I checked...
Long story short, no evidence for you, but for good reasons.
7 aquariums, 4 terrariums, 6 cats.
Proud to be a PetSmart employee!