That's a very open ended question in this hobby. What kind of corals you keep can vary that answer widely. With a bit more info, you'll still get a variety of answers, but something more tailored to your needs
That truly is an open ended question, as fishlipz states.
I would say Alk: 8dKh, Cal: 420-480ppm (Depends on what you have), Mag: 1320-1480ppm (Again, depends on what you have). The rest you would like to have as undetectable.