Was wondering - has anyone used the method outlined by BReefCase in the archive thread ( http://reefs.org/phpBB2/viewtopic.php?t=13770ad ) ? Specifically the addition of vinegar to the Kalk mix in order to drive the chemistry to our benefit? I have been doing this off and on for about a year with no "bad" effects I can detect - only a slight but definite Acetate odor to the skimmer product after a period of heavy dosing. Over the past couple of years have clams ranging from ~ 8" to 6" growth - so some seem to like something - don't have the ability to do a controlled test of one tank adding and one not.