well i read all the post on salt mixes, I've been the retail, aquarium service & custom aquariums business for 28 years and still learnig. i've seen beautiful aquariums done every different way and use every different salt, from water changes once a month, and as unfrequent as 4 months ( but never an sps that was growing well or thriving with 4mo. water changes but many lps and softies ) i have used almost every salt out there at one time or another, and not to mention beautiful sps tank thriving and growing like crazy, with water mixed right out of the of the tap, thats right, right out of the tap, no RO/DI, mixed and put in the tank all within 60 mins. from the most basic filter systems , to the most elaborate computer controlled systems with 100% water change over 30 day period. the best advice i can you all is to find out wants in your tap water first. some times its not whats in or not in the salt, its whats in or not in your tap water, the single best thing you can do for your aquarium is do regular water changes that is if you have good water, you may need as little as a good carbon filter, or you may need an RO or RO/DI unit where i'm from in most cases you don't even need a carbon filter but we do recomend them, and we do have alot reef keepers who use RO/DI units but there's very little waste water and the membranes last 4 times longer or more, alot can depend on where you live goelogically on how good your water is.
My choice of salt has always been Instant ocean as far as i'm concerned its always been the standard to meet, next would be red sea salt, the unique thing about red sea salt is its taken right out of the red sea and no two batches are exactly the same, and all my service customs who use it their coral grow very well. 3rd. is kent marine and same goes for my reef customers who use it. but keeping in mind they all have great filtration, lighting, circulation, many run chillers, and most but not all of my SPS customers have calcium reactors, some form of algae filter, or the new thing is live sponge filters.
It comes down to the old saying if it works for you keep on doing what your doing.
fishman