...and I would keep your location under your hat. If somebody finds your location and complains (which they have every right to) you may find yourself out of a job in short order.
This is the super forum of uber marine aquatic specialists, and based on some of your posts that have been brought to light, you are so clearly not one of them. I'm a beginner, and I can see that.
For Petco to be putting folks like yourself into positions of expertise like that ought to be a crime. That's not your fault, it's Petco's. It's cool that you are getting first hand exposure to learn the trade/hobby, but really, they aren't doing you any favors.
I would urge you to cease and desist from giving any advice to customers on salt water aquaria. Be upfront with them about your beginner status, and point them to do their own research before making any purchases...especially livestock. Give them bad/incorrect advice, and it will return to haunt you.
Petco's only do FO as far as marine goes. All of their holding tanks are linked together, so a disease that's in one tank, is in all the tanks. Since they don't quarantine, you probably treat with copper as a profalactic, right? There's a Pet Extreme where I live that is set up the same way, yet every Wednesday, they still stock their SW tanks with a new shipment of snails, crabs, dusters and anemones, and they always look terrible. The only chance they have is if they get sold immediately. The copper and nitrates in these types of systems is a death sentence for them. As a beginner, I looked up to their staff and assumed I was getting good advice.
How long have you worked there? What is your SW fish loss rate there... Honestly? I've been into more than my fair share of these places, and most of the time, at least half of their livestock are visibly ill...not to mention the ones that are already belly up. The holding tanks are waaaay too small for the specimens they sell. Some are run better than others, but the basic recipe is seriously flawed from the git-go.