Yikes! pH spike! - Fertilizing

abnormalsanon · 06-10-2006, 06:25 AM

I overhauled my tank yesterday (new flourite substrate, new slate rock) and was quite pleased with the result. This included a fairly substantial water change (about 2/3). I knew it would be stressful for the fish, but they're doing well.

However, I tested the pH this morning and it's at 8.0! The pH is normally 7.6-7.8, depending on the time of day. My tap water is at 7.4 this morning, and my goldfish tank is at 7.6. I can only assume the pH will go up this afternoon, and that worries me. I have DIY CO2 going, but it's not all that effective. I know my water is hard, though I don't have a test on hand to provide exact levels.

I thought slate rock wouldn't mess with my levels, but maybe that's wrong. I'm not sure what else could be the problem.

What can I do to naturally lower the pH? I had some driftwood in the tank that I removed. Should I put it back? It doesn't really fit in with the scape but it could be worth it if it lowers the pH. Any other suggestions?

hoppycalif · 06-10-2006, 07:40 AM

Why worry about the rise in pH? Unless it is caused by a sudden big increase in carbonates I wouldn't worry. And if I worried, I would change 50% of the water. All rocks put into the tank should be tested with an acid, like swimming pool acid - muriatic acid - to see if it bubbles. If it does it will increase the hardness and probably the pH, but slowly, which doesn't harm fish or plants.