Ca/Alk/Mag Mess . . . How to fix?

[Lampshade]

Before you do anything, is coral OK? i recently nuked my tank because my alk test said 6dkh and calcium said 420. Be VERY careful with your tests, i took an API and a salifert beside each other with one saying 6-7dkh, the other 17dkh.

Basically what i'm saying is before you do ANY corrective actions, first make sure you actually need the correction, and if you do, get a second opinion. I lost $1500 worth of SPS because i cheaped out on a test kit then trusted it, don't do the same :P.