RichToyBox wrote:
My suggestion would be to add the baking soda. With only 2 dH on the KH,
the filter bacteria are probably mad at you. That is the reason you are
having NO2 and the pH will come down some, and be more steady, morning to
evening ...

The NO2 measurement is less than 0.3; that is the lowest measurement on
the test -- it doesn't measure 0. The fish don't seem to be oxygen
starved -- they're not at the surface gulping air at any time of the day
or night. I'm just looking for ways to get back to "crystal" water or
something closer to it. I suspect the fish are enjoying the green water;
they're all very healthy, except the whiter ones are slightly yellow
probably from eating the algae from the sides of the pond.

I've added baking soda and will retest the pH and KH later today.
--
zookeeper