its your tank dude so do what you want and most ppl recommend an ro/di unit however i do not use it. i use just bottled water from the dispenser at the grocery store. and reef salt
Well, I am really not a salt expert. My opinion, I would stay away from Instant Ocean. That's just me. It is entirely possible it is good and I have no reason to not recommed it other that what was already said. Before I discovered my free sw source I was using the brand I posted above because my LFS recommended it and all the test I did indicated it was really good. I am sure both the brands Grins recommended are top shelf as well.