Thanks mommy1. I am very uncomfortable with the advice I am receiving from the other forum. I really like their fish profiles - this is the first time I have posted to their forum. They want me to buffer my water to satabilize my pH. My pH is stable at 7.2 at each water change. I even have the Seachem in-tank ammonia and pH alert sensors. They are great. I test with the API master kit at each PWC, but these give me a reading anytime I want. Ammonia is always in the safe zone and pH is 7.0 - 7.2 consistently. I don't really see the necessity of adding a buffer. I know the general consensus here is to leave the pH alone, if possible.