Quick question guys. My ammonia, nitrite, was zero, nitrates were in the usual range, ph a little low. Did WC, added ph buffer to bring ph to 8.2 , ammonia 0, nitrite 0. Added 4 new fish. The ammonia increased to .25, fish were doing fine, I was adding fritz turbo 900. The nitrite was still 0, nitrate normal range. Ammonia still stayed the same. Did a small WC (20 gallons) while cleaned the sump (rearranged biomedia and tried to siphon out dirt) smelled bad figured it was due to the turbo because added that to the media in the sump along with DT. Tested just now, ammonia seems slightly higher, I now read nitrites at .25, ph is also low at 7-7.5! Planning on doing another WC in the morning. Any suggestions on what’s going on, I finally have some nice fish in the tank and don’t want anything to happen to them, they seem to be doing fine now but want to make sure the tank is stable.