Grow little guys... grow.
Join Date: Mar 2008
Location: Chicago, IL
I thought I'd toss this in....
I usually keep my tanks around 6.7 pH, and when I do my weekly water change the pH jumps up to 7.4 because the new water doesn't have any CO2 in it. This change happens relatively fast, over the course of 3 minutes. In the beginning, I was overly worried that the shift in pH was going to stress the fish. Several years later, the same fish are still going strong and are healthy as ever. (Tiger barbs, zebra danios, galaxy rasboras, shrimp, etc. nothing exotic.)
I was a little more relaxed about this when I read that fish are more sensitive to changes in pH when that change in pH is caused by changing the KH quickly and drastically. But if the KH remains close to the same and the pH change is caused by acids (like adding CO2), then the effect on the fish is not that much of a problem.
I wish I could find where I read that.... So I don't know how accurate my comment is.
Jeremy Squires, Toronto, ON
One should never have to decide between chocolate, cake, or cookies.