Does Co2 mess up a fish-in cycle?
Before I changed to my fluval edge, I had a couple fish in a 5.5g tank and I was trying to cycle while growing plants at the same time. I went to the pet store for a water test after quite a while and the test showed pretty much no real progress with the cycle. It also showed a very low ph. The woman working there seemed to think that my DIY co2 system caused the water to become to acidic and it killed off the bacteria I needed.
I have another tank now, and it's about 4 weeks into its cycle and it actually is making progress. However I want to set up co2 again for my plants. Is there any truth in what she said about it killing bacteria?
I also had a piece of driftwood in the tank, which I know can lower ph, but its in the new tank too, which has normal levels.