Honestly.. i would not buy anything from a chain market. If they say it's fiji premium live rock.. then MAYBE you can trust it. Think you can take pictures of it? Because im sure if we saw what it looked like.. we would be able to tell what kind of rock it is. We would also be able to see what the rocks conditions are.. If they have algae, Coraline, and all those good things you should be getting when you purchase live rock. If your going to be spending that much money.. wouldn't it be peace of mind to you, to be 100% confident on what you are about to purchase?
Personally, i have never dealt with anything SW
from any chain markets and i know a lot of people that do not either. Unless there is a local pet chain market that you have experience with and trust. I know someone here who likes a place by them called petland. Says it is a good place since the people there actually care about their animals. All i can say is.. i've been to petsmart and petco and other animal chain markets and their livestock conditions are never as good as local fish shops, that are dedicated to.. FISH. So you gota think about it.. Fish stores need to dedicate their time and experience to fish because that's what people go there to buy lol. Not always the case with petstore chains that sell a huge variety of things in their store. Kind of makes sense to me.. lol :s