Calcium ?

[Beverly]

Originally Posted by danny zubot

Good to know. I have added vinegar in the past but I am always hesitant because, well, its vinegar. Thanks!

Danny,

You've got to read the links I provide The following quote is from:

High pH: Causes and Cures:

http://reefkeeping.com/issues/2005-03/rhf/index.htm

Addition of vinegar via limewater. Commercial distilled white vinegar can be used to reduce tank pH by adding it to limewater that is subsequently added to the aquarium. Do not use wine vinegars as they may contain undesirable organics in addition to the acetic acid. A reasonable dose to start with is 45 ml of vinegar per gallon of limewater.