TomK2
Aquarium Advice Addict
Also, you have to ralize that nitrifications is effected by pH. At a pHof 6.5, nitrification is significantly impaired, and it stops at a pH of 6.0, and the bacteria quit growing. So, at a pH of 6.6, it would take longer for your bacteria than in a tank at pH of 7.6. I don't know if your tap water is that low in pH, or if you have intentionally made it that, or if it is a result of few water changes in water that is rather soft and low alkalinity (KH). But if your tap water is a higher pH after standing out all night than your tank, you could help the situation by dowing PWC's to raise the pH, as well as lowering toxins for your fish.