Okay I'll see what I can do here.
This is just my opinion.
In all my years of saltwater fish keeping I have never relied on a salt to do anything but make the water salty.
I don't have anything but softies so probably not the best one to respond on coral requirements but no matter what salt you use you'll have to test and adjust accordingly. Does that make sense?
I don't think one salt will give you everything you need and bam,you're done dosing. You may need to add mag, like Kevin, alk, calcium or whatever. You'll get to know your tank and corals and when/where/what to add.
I use IO as I mentioned.
I switched from red Sea and honestly I can't tell any real difference even though each salt advertises differently on the tub.
My opinion is try a couple if you want then find one and go with that. Be consistent.
Hope that helps (probably not).
I don't explain well.
Keep asking lots of questions.
That's what we're here for Luis
Another good thing to keep in mind is pick a salt that you can readily obtain.
I can buy IO at my LFS but nothing else.
I also live in Antarctica
