How high is too high for calcium and magnesium?

[Dag95833]

Are these levels getting to the point of concern? Everything seems to be doing good.

 

[Spare time]

Calcium isn't a problem when high except you might get problems keeping alk in check. However, magnesium can kill your inverts when it reaches high numbers. As long as the inverts are not dying or snails falling off rocks then I wouldn't be too concerned but you can always fix that easily with a small water change.

 

[Randy Holmes-Farley Verified Community Expert]

I would generally try to keep calcium below 550 ppm and magnesium below 1500 ppm.