The only additives you need to keep most corals are h2o, a salt mix, and light.
They really are rather undemanding.
Originally Posted by Ivanthegod
Go with Marc wise, " coral vital" and at the same time purple up by caribsea
Avoid purple up like the plague. I've seen dozens of people on these forums have major problems because of it. It does absolutely nothing that a good water change wont do better.
As for coral vital, I would like to +1 the post about never adding anything thaat you don't test for. A good water change has every element that your corals need.