Apocalypse_Gold
Aquarium Advice FINatic
I did a 20% 50/50 RO/tap water change last night and this morning I had three dead or nearly dead blue tetras, so I decided to test the water. It had a pH of 7.6+, so then I tested the water I added-7.4, so then I tested the water I had taken out-7.2! What Is going on here? The only other thing that I did was filter the water with cheese cloth (I tested a sample of it in the old water-7.2-no change), and replaced the filter media with an old piece that had been rinsed out. How can the pH in my tank be higher than the water I took out and the water I added?!