ManWorld42 wrote:

Are you serious? If the pH of the tank is 8.0 and the water supply
has a pH of 7.4, each water change administer a pH shock.

It's not at all uncommon for tap water to have a different pH than the
established tank water. Mine tends to vary by about 0.4 to 0.6 as well.
If you're doing large water changes, certainly it's a shock. But in a
ten percent change, the impact on pH is very small.


--
Eric Schreiber
www.ericschreiber.com