|
Gary, Just a thought. I once calibrated my ph monitor with 4.0 and 7.0 solution instead of 7.0 and 10.0 and got low readings. Not that you did that but just in case.
__________________
Tom
Current Tank Info: Tank of the Month , November 2011 : 600gal integrated system: 3 display tanks (120 g, 90g, 89g),several frag/grow out tanks, macroalgae refugia, cryptic zones. 40+ fish, seahorses, sps,lps,leathers, zoanthidae and non photosynthetic corals.
|