:help:
So I have 3 FW tanks. All have a steady PH of about 6.4 - 6.0. Why is this the case? I've been using crushed coral, no c02, aquarium salts in small doses. the ph of my tap is about 7.2 - 7.4. I do 35 - 50% water changes weekly. 10-trates 0-trites 0-ammo except my 10 gal, it has almost 0...