Calcium levels over 600.......what is best to do?

[Aquattro]

Originally Posted by The Grizz

My cal is really that high and it has not affected the sand one bit

Not an overnight thing, but will eventually happen if left too long. I know, I pulled a sand bed out of my 90 in three large pieces

Other than that, not a huge problem, minus potential damage to pumps in the long term, but if you add a lot of coral, it will eventually go down.
But, a water change is a quick and easy fix.