May 13, 2012 #1 Hardridge Aquarium Advice Freak Joined Dec 9, 2011 Messages 410 Thought ph goes up when lights come on mine does opposite. It goes up at nite
May 13, 2012 #2 Sniperhank Giant Clam Addict Joined Nov 18, 2011 Messages 20,651 Location Summerville, Pennsylvania It goes up slowly as the day goes on.
May 13, 2012 #3 OP OP Hardridge Aquarium Advice Freak Joined Dec 9, 2011 Messages 410 Barely goes up but when Lites go off it rises