Well, I have been working on two tanks (different locations) with those three levels.

CA - 350
mg - 950
alk -120

Caused major dino outbreak.

now Ca - 460, mg 1100, alk 170 and the dino is going away

Goal for the levels is
ca - 450-500
mg 1300-1400
alk 170-190

Having those at the right levels make all the difference in the world!