Most people with Fish Only (FO) or Fish Only with Live Rock (FOWLR) tanks are satisfied with keeping their pH in the proper range (8.0-8.2), while many Reefers get into the more complicated process of balancing pH, DKH and alkalinity. Some excellent Forums strings which delve into the more detailed method:

Forums: Pinpoint pH monitor Just put my ph monitor in today. It's registering 7.83.

Forums: Still confused on Calc/Alk From what I understand if I dose with kalk it would have an adverse affect on my ph...