Jan 30, 2013 #41 G gravereaper0 Aquarium Advice Freak Joined Nov 16, 2012 Messages 380 Can you place the drop checker in the sump return area or will that give you a false reading
Jan 31, 2013 #42 CorallineAlgae Aquarium Advice Addict Joined Apr 21, 2012 Messages 3,115 Location Louisiana You want it near the plants. That's where the co2 level counts.