I’ve been trying to lower down my pH and I just realized that certain rocks may raise the pH level in an aquarium. Can you please confirm what type of rock this is so I’ll know if it’s the culprit in raising my pH?
I dont know, but you can test!
A common geology trick is the 'acid test': get some muriatic acid (not concentrated), and dump a few drops on the rock. If the rock contains carbonates (which raise pH) the rock should bubble.