Graham Broadbridge graham at peachy dot org wrote:
tank from scratch. It's a community tank, which until I moved had very
happy plants which were often pearling streams of bubbles during the day
when the lights were on.
snip
unable to increase kH to increase CO2 concentration. I've never needed to
add CO2 with a reactor before, so there must be something else I missing.

You had pearling without added CO2 and with less than 2 watts per gallon?
How is that possible?

How far away did you move? Are you in a different water supply? I bet it's
something in the new water.

--
Victor M. Martinez

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