linda mar wrote:
(low=20, high~100), and pH is like 9.3 average.. the tank is 8, so either
the fish/plants/driftwood is altering the water, or just going from our tub
to the tank changes the pH.. don't know which (since I don't have the

Both. Your tap water will change pH after it degasses. Also, normal
metabolic processes in the tank tend to lower the pH. My tank is usually
around 7.8 or so.

--
Victor M. Martinez

http://www.che.utexas.edu/~martiv