Welcome DGA, really glad to have you aboard. After you are ready to begin alkalinity support, you might also consider these options:
1. How will you know when you have enough added to the system? Purchase an alkalinity test kit. I use a Seachem tester, fairly accurate IMO. If I recall correctly a typical reef target range is 3-10 mEq/L (right Matt?) To validate this claim DGA, just hop over the the reef chem forum located on the lower part of the forums page and run a search for an alkalinity article from Randy Homes-Farley, and the target range will show up quickly.
2. What is the consumption rate of your system, the acid-binding characters that set how often you must replenish the alkalinity? in other words, it's a little too general to tell someone to add carbonate every three days or every week unless one is very familiar with a particular system design... typically, when you reach your target goal of _____ milli-equivalents per liter each system tends to have varying lengths of time until they reach your lowest acceptable threshold-all affected by water volume, stocking density and waste production of the animals, water quality/maintenance schedules and several other items that affect the chemical stability of the system. On that note, it is good to seek out a target range, slowly raise the system up to that point, measure daily (without adding additional buffer) until the system reaches your lowest acceptable mEq/L and then notate that length of time. Replenish slowly again at the end of those intervals from any one of the common sources-- In nanos I like to recommend C-Balance or ESV ionic supports, they are cheap and effective in nano systems.
Hope that helps, B