I started out innitially using Reef Salt from seachem but switched over to IO recently. For the time being, I've only had to dose calcium and mag...sometimes strontium in my 8 foot tank. Mind you, there aren't many calium hungry corals in that one...mainly softies and mushrooms.
I have been using IO for the 90 that is currently being born and I havn't hade any issues with it as of yet, but we'll have to see once corals/clams etc start making their way into the tank
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