I've gotten a lot of fish and supplies from Petco over the years. I have FW
tanks. I just got a starry blenny and some astraea (sp?) snails from there today. I've never had a problem with the fish being sick from there, ever. They usually have what they call "aquatics specialist". I've found that's the person to ask questions to. The guy at my Petco has SW
tanks too and has been doing them a while. I also get my SW
water from there cuz I don't have a RO
system yet and it's only 25 cents per gallon. They don't really advertise the water, but it's available.