I'm a big fan of Instant Ocean, but I agree that the brand you use is really not that big an issue....I even used Coralife once with no destruction of my tank. Its not an issue with switching brands either. What is more important is where you get your salt from. Ideally, the best is a large bucket from mailorder...(Dr. F & S still has IO for $29 and only $9.95 shipping) But we all have emergencies, and that's where the LFS comes in...Buy your salt from a place that does business in SW, and will have a high turnover. If you buy from a local Petland that ordinarily does zilch in terms of salt water business, there is a good chance that the salt has been sitting around forever...regardless of brand, old salt, especially in a bag, will screw up your alkalinity, etc. That happened to me once...for an emergency water change, I picked up a 25 gal bag of Reef Crystals at my local Petland, only to royally mess up my tank. I called up the manufacturer, who explained very nicely that the salt was too old, and sent me a free 50 gal bag so that I could see what their salt is really like. I appreciated that! (But I still prefer IO....) Take care, Eric