Man it's been quite awhile since i've been on reefs.org.
Anyway, i agree fully w/ smcnulty! No additives! You don't need them, they're just gimmicks. When do see mother nature pour in "snake oils"? Right, NEVER!
Anyway, i only dose Kalk every night/day (whenever it settles and can be dosed is when i do it). This replaces Kalk and balance the hardness continuously. To replenish lost ions, i perform frequent water changes (not the 25% monthly, by then it's too far out of synch). I change 5 gal EVERY week w/ fresh makeup. (remember to aerate the water at least 24 hours, or use a commercial mixing paddle to ensure consistency).
Take your time, keep up on maintenance (an oz. of prevention is greater than a lb of cure), and your hobby will blossom.
HTH,
DW302