Save your money and don't use those, especially for a new tank. (Unless of course you just plain want to help the store make money)
I agree, DON'T add anything you can't test for.
For a normal tank there is NO need for Coral Vite, Iron, Strontium, or Iodine in any of it's forms.
I have many tanks and in seventeen years of reefing have not needed any of these other than calcium, magnesium and alkalinity replacement chemicals of which the above pictured Reef Calcium is an expensive way to go about it.
I've been told over the years to use this or use that, and indeed before I got a computer in 98 and discovered people like Randy Holmes-Farley, I tried some of them. Now, I know better and my tanks have done perfectly fine without. It means I have more money to spend on the things I like, not what stores tell me I need.