I work at petsmart and I can tell you there is good and bad. We have two separate filtration systems, one for feeders and one for everything else. This means that from goldfish to cichlids everyone is at the same temp. The filtration system is massive and has multiple uv sterilizers, we also treat the system with mal green weekly. On the down side our supplier sucks. If we get in 200 fish, there are 30+ dead ones. Fish are bagged 5-10 per bag, plecos more. Most of the problems we have are ich, ammonia burn from their time in the bags, and fungus. I'd recommend you find out what day the shipment is delivered (usually Fridays during the winter) and wait a few days before purchasing to weed out the sick ones. On the plus side, most of my coworkers know the basics of fish keeping. We teach the nitrogen cycle and do not sell fish that aren't compatible into the same tank. I'd never buy anything from my petsmart except rosy reds but to each their own.
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