IO has decent Calc/Alk mix... the magnesium is appernetly low in their mix, i supplement on water changes. I had a site a while ago that showed levels for most of the main salt mixes, trying to find it again now... i need to start using more bookmarks
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RC's forum on salt mix calc/alk/mag:
http://www.reefcentral.com/forums/sh...readid=1287118
Here's an article that shows EVERYTHING:
http://www.advancedaquarist.com/2005/12/aafeature1/view
Here's a table showing high or low(10 years old, probably changed since then):
http://saltaquarium.about.com/od/pla...Primary-El.htm
Here's a couple showing trace elements:
http://advancedaquarist.com/issues/sept2004/feature.htm
http://reefkeeping.com/issues/2002-0...ture/index.php
http://www.advancedaquarist.com/2005/11/aafeature1