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thriceanangel
04/06/2006, 08:16 PM
Can you overdose a tank on Ca, or Carbonate (Bicarb)?
Randy Holmes-Farley
04/07/2006, 06:16 AM
Yes. Both need to be kept in appropriate ranges. This article has more:

Reef Aquarium Water Parameters
http://www.reefkeeping.com/issues/2004-05/rhf/index.htm