like Terry, I also use Marine Buffer. This maintains your alkalinity and adds carbonates and bicarbonates in a ratio that pushes the pH towards 8.3.
What I like about Seachem is the transparency of the mechanisms through which their products work. I'm a big fan of totally understanding everything about my tank, including any additives that I use. If you don't understand something about one of Seachem's products, ask them and they will explain it to you, in as "layman" or as scientific a way as you require.