What To Do.

If your system is out of wacked.

1) Test your CA and ALK parameters.

2) Correct your ALK parameters first by dosing both CA and ALK as balanced parameters, use the ratio as explained below.

3) Dont bother testing CA for now since ALK is the more caustic if allowed to overdose.

4) After determining your ALK consumption rate, and you were able to stabilize that value for at least a week, then you can start testing for your CA parameter.

5) If CA is high, then just keep dosing both but with less calcium until you reached the equilibrium.

For reference.

Reef Chemistry Calculator