corals, most likely no dosing would be required. Calcium, alk
and mag is used by corals when they grow their hard skeletons. The skeleton of LPS
corals grow pretty slow, so regular water changes should keep the parameters in line. An occasional dose of each may be needed, which is why it's good to get into a routine of testing your water parameters.
When a coral forms its hard calcium carbonate skeleton, it uses a fixed rate of calcium, alk
and mag. The ratio is 18ppm calcium - 1meq/l (2.8dKH) alk
- 2ppm mag. In other words, if your corals are depleting 18ppm of calcium from your water, they willl also deplete 2.8dKH of alk
and 2 ppm