[BoomerD]

With good calcium, alk and light levels, coralline will grow just fine without "purple-up" or (agghhh) reef vital. IMO, the Marc Weiss products are just snake oil designed to separate you from your hard earned fish dollars...Do they contain things that are beneficial to your tank? Probably, but the important elements and ions are also in that bag of salt mix that you use. Avoid ALL the junk supplements that the LFS tries to get you to buy, and you'll have more money for corals and fish, PLUS, your tank will be healthier. The ONLY things you should be supplementing are calcium, alkalinity, IF testing shows them to be low...
NEVER supplement ANYTHING that you don't/can't test for!!