It really depends on the corals you plan on keeping. Honeslty, all of those "coral and reef additives" availible at the LFS are just a waste of money. Regualr feedings of the appropriate foods and maintaining the proper ALK/CA is all you need to do.
Yup Yup, don't waste your money. Most of those products are just algae blooms in a bottle, definately avoid anything by Marc Wies. Also be really careful of any "coral food" liquid suppliments. If you are thinking about one post it on here or really check whats in it and do some research because the majority of those are snake oil blooms in a bottle as well. Regular water changes, maintaining ionic balance at proper levels, excellent water parameters, and proper lighting is all you need to keep most any coral that doesn't require direct polyp feeding happy.
Here's to swimmin with bowlegged women.
Reef with 30G Sump/Fuge Combo
-30G LTAnemonarium with mated porcelain crabs, 10 sexy shrimp, and 2 pink skunks all tied into the other 135G in my system.