Alot of people will say that a retail store will run there tanks in low salinity otr copper to suppress diseases or parasites. Which may be true but their are local reef stores that care about their customers and quarantine their fish before hand. I know mine does and I wouldn't buy a fish from any one else. They take pride in their business and it shows. I've never lost a fish from there and neither has my buddy. We don't quarantine and we've bought probably 20 fish between the 2 of us. I'd say stay away from online fish retailers for fish at least. Corals are one thing but I think you should actually physically see and watch your fish before you buy it.