There was a study a couple of years ago that showed that Instant Ocean was overall the best brand of salt..yes, it showed that Coralife was one of the worst. In my first few years of salt water, I experimented with several types of salt, including Coralife, IO, and Reef Crystals...others I forget. I have always found IO to work perfectly well for me, and have stuck with it exclusively for the last 5-6 years. Its not as cheap as it used to be...their 200 gal bucket is now a 160 gal bucket...shipping will never go down..but its still probably cheaper than the others...well, there are some real cheap brands, mostly the type used in lobster tanks. Take care, Eric