I have not ever had pH problems other than too high if I were to try to use well water (10+) Mine have always run at about 8.

Today, my routine weeky tests and water change revealed that my tub (extra fish that I am "baby sitting!) has dropped to 6!!!!!!!!!!!!

Where that came from beats me! It has never happened before.

I will never, never, never fail to test pH every week, without fail. There are times when I was rather lazy and did not do it. Everything else looked good, so..... why bother.

NEVER AGAIN. TEST TEST TEST!!!!! Yu just never know!