Need help cal and kh lvls

[russthemuss1]

I a little bit of help. all my lvls are perfect except cal and kh

cal 220 how do i bring this up and what is the perfect lvl to be at
kh 21 how do i bring this down
right now the only thing i am introduceing to my tank is purple up and phyoplankton corals seem to be doing fine

[almostazoo]

hope this helps
http://www.reefcentral.com/forums/blog.php?b=102

[Rockys_Pride]

That was what I was going to suggest, checking/increasing mg

[Sugar Magnolia]

How old are your test kits/what brand are they? Those numbers seem a bit suspect, especially if you keep up with regular water changes.

Magnesium does affect your calc/alk levels, as mentioned, but I'd suggest taking a sample of your water to a LFS and having them run some tests to double check your test results.