It's true that often LFS don't properly care for their animals I will venture to say that most small business LFS do. If they are smart business people they do in other words. Part of the petco problem is that they are a corporation and another big factor is the systems they use for life support. The saltwater section typically runs off of one or 2 sumps and they keep the salinity in the coral section at around 1.023. I run mine at 1.028 for example. With setups like this if a disease breaks out in one tank then it spreads throught the system. So if you see a sick fish in the tank next to the tank you buy from and both are saltwater then the thing you don't know is that those tanks are sharing a sump. The same is true for their so called quarantine tank thats in the display if they have one. Sure they medicate that tank but when the water flow turns over its spreading throughout the entire system.