Originally Posted by ram6519
has told me to use Kents Coral Builder once a week. Is that why my reading is so high?
Yes, unless you have something within the tank using it, then all you will end up doing is increasing the alkalinity rather than mainatining it. It really depends on what types of corals you have. If no scleractinians, you won't really need a buffer like Coral builder. Small needs are best met with water changes.
demand increases, you may need suppliments but both Ca
and alkalinity must be monitored as a balanced equation. If one is affected both will be and should be maintained in unison.
What corals do you have?