Checking my water at it's worst, just before my weekly water changes, my nitrates have risen up to 5ppm. I'm assuming this is acceptable sincve I've heard it's rare to have 0 nitrates. However, I've heard that my cardinal tetras can be sensitive to nitrates, so I'd like to keep an eye on them. What levels should make me comfortable, uncomfortable, and when do I need an early water change?
Thanks!
Thanks!