When you keep softy's, regular water changes are sufficient. With that said, LPS
demand calcium. In order to maintain calcium, the alkalinity and magnesium have to be at optimum levels. You can start with a two part dosing scheme. Two part is dosing calcium and dosing alkalinity.
Since you already have the alkalinity test kit (KH
), now you need a calcium test kit. I would start by purchasing the test kits and try raising your KH
level. Should you be dosing for a week and nothing happen, then you need to address your magnesium level.
You don't have to start dosing right away, but if you want optimum coral growth then yes you should.
Watch this video from newyorksteelo about calcium/alkalinity. It will explain things better.