I'm willing to bet they don't worry about cycling at all! I worked at PETsMART for 3 years, but I wasn't there when the store opened. My experience with them is that they give the associates the knowledge that's going to make the company the most money. I honestly don't think they are too worried about training associates in the tried and true methods of fish, reptile, and small animal keeping because they know that most associates that work for large corporations are there to make a living first and foremost and not necessarily very experienced in the actual care of all these animals. I was one of the few associates in my store who actually took an interest in learning as much as I could and in the 3 years I worked there I didn't learn a whole lot and a lot of the things I did learn weren't accurate. They are more concerned with training for customer service and give extremely limited training on actual animal care. I would be willing to bet they dumped a gallon of Cycle in the system and let it run for a week or 2 then called it good. You have to realize the size of these companies and the money they pull in. Them losing half their fish stock due to uncycled tanks for the first month or 2 that the tanks are running is something they know they will bounce back from. The tanks WILL cycle eventually. The thing is that these corporations don't view these individual animals as their own. They are money to be made. Any losses are tax deductible so they may actually not mind losing a couple thousand dollars worth of fish in a week. It adds to their write off and tax savings at the end of the year and they want to get their max tax deductions. This is definitely what happens because they do take inventory of fish loss every night and I assure you it's not to find out what can be going wrong with their tanks. I'm not trying to paint a picture that these companies absolutely don't care at all about their animals they sell, but I GUARANTEE you that their #1 concern is the bottom line and their shareholders! PETsMART, PETCO, Pets@Home, etc. are glorified "WalMarts" for animals and animal care. WalMart, by the way, is the ONE place I will NEVER purchase a fish or ANY live animal they may sell in the future! At our local WalMart they actually have a sign up at their bagging station for their associates stating, "Do NOT use tap water to bag live fish, it will kill them!" I don't know about you guys, but that's not a place that I want to encourage to sell me a fish.....
Petsmart is horrible. I don't/haven't worked there but a close friend does.
As said I highly doubt the big pet stores cycle their tanks at all. Sometimes I wonder if they even bother with dechlorinator.
At my local petsmart, they use one giant filter for all the tanks and they're all linked up to the one system (apparently). Also, every tank is infected with ich but they don't tell customers this. They can only say "yes" if the customer asks if the fish is sick, but cannot identify it as ich. When I went there the other day they had a full tank of tetras and loaches covered in white spots and everything was still up for sale.
I knew petsmart was bad but after hearing that, I'm never buying fish from them again.