http://www.reefkeeping.com/issues/2004-09/rhf/ http://www.reefkeeping.com/issues/2004-09/rhf/ http://www.reefkeeping.com/issues/2004-09/rhf/ http://www.reefkeeping.com/issues/2004-09/rhf/ lower the sea to a pH of 7.8 http://www.reefkeeping.com/issues/2004-09/rhf/ Reefkeeping: Low pH: Causes and Cures http://www.reefkeeping.com/issues/2004-09/rhf/ Reefkeeping: Low pH -- Causes and Cures http://www.reefkeeping.com/issues/2004-09/rhf/ http://www.reefkeeping.com/issues/2004-09/rhf/ http://www.reefkeeping.com/issues/2004-09/rhf/ http://www.reefkeeping.com/issues/2004-09/rhf/