I don't mean to offend, but I'm curious as to why anyone would use salt other than Instant Ocean. I don't know if this is only my experience, but every single other brand I've used (including reef crystals) has left my mixing station full of a brown film. I've tried many different salts and I don't see any difference in tank health when compared to IO. They all seem to perform the same, but IO is soooo cheap and mixes clear (very important to me). I get that some salts come with this additive or that additive, but does that have any impact on tank health? I've never noticed a difference in results. Sure you can find a salt that matches your tank parameters, but consistent dosing or a CaRx will get you right back to where you want to be. I just feel like there are so many other things to worry about that salt mix is pretty much a non-issue. Cheap and clear is my only requirement and IO fits the bill.