Planted Tank Obsessed
Join Date: Dec 2012
Location: Lehigh Valley, PA
pH and KH rising, rock suspected
Never had this happen before. My well water is 6.5 pH, 0 KH, <3GH. Been noticing a steady climb in pH and KH. Two days ago, pH was 7.2 and KH was 2. Substrate is black sand, being used for 15+ years, never affected water before, minimal dosing of flourish for the plants. All rocks passed the the acid test, no bubbling. I use Seachem equilibrium to bring up the GH to 5. Some Malaysian driftwood and a handful of oak leaves from my backyard. 20% water change about 3x a month. Inhabitants are blue pearl shrimp and snails.
Like I said, I never had the happen before, pH drop, yes, rise, no. Anyone have experience with a rock "cheating" on the acid test? The only other theory I have is the snail and shrimp shells leaching calcium, but this seems a bit of a reach.