Magnesium and calcium levels

[Aquattro]

Originally Posted by Metrontech

So higher Calc is bad? Does it affect the lps etc?

Not bad per se, but not needed. Ca on a reef is about 380ish. That's all you NEED. We keep it a bit higher in tanks to account for any sudden drops that might happen, giving us some wiggle room. Aiming for 400-420 is fine and leaves you that room.
What salt are you using, and how did you get to 450?