Reef Additives - Best Combination

Hi:

When it comes to adding to reef tanks does anyone have an opinion on the
best chemical's for calcium, iodine, and simply the total treatment. I have
consider Seachem, Kent, Tropic Marin, and Siefert. I currently use
Kalkwasser and Lugols solution, but the expansion on my corals could be
better. I have used biocalcium in the past. Kent seems very expensive by
the time you buy all that is recommended. Has anyone tried Siefert?

Thanks in advance.

Wayne