It was in the topic "What brand of salt do you use" or something like that. Someone linked it and I just saw it yesterday. A study was done on the various brands of salt mixes. I was all set to buy Instant Ocean when I start my tank, but after reading the article, I will get either Crystal Sea Marinemix or Bio Sea Marinemix. It was a very scientific study, and I admit I didn't read it all. I did read the summary and the charts carefully. They raised larvae in the various mixes, and some mixes had more of a mortality rate than other mixes.
So I did a google search, and found the two brands I'm considering here:
I was surprised to see that they had a dechlorinator too, since RO
water is usually used to prepare saltwater, and I thought the use of tapwater was "frowned upon"!