low ph

[sanababit]

woke up today to see my ph meter at 7.56, i said it must be a mistake so i took out my test kit and tested water, the kit said it was at 7.8, why did it go so low, i have always been at 7.9 at night and 8.15 at day, any ideas, could it be CO2, to much calcium??, please help, the tank has been running for more than 4 months


sana

[bertoni]

Calcium doesn't affect pH. The issue likely is CO2 problems, or perhaps a bad measurement. I'd try the aeration test in this article:

http://www.reefkeeping.com/issues/2004-09/rhf/index.php

[Percula9]

What is the alkalinity of the tank?

[sanababit]

last time i checked it was at 7 dkh, let me chec k it again, will be right back

sana