On Mon, 14 Jul 2003, jammer wrote:

My water is clear with no pump, etc, but is there really such thing as
too many plants? How do you tell?

I have been shading the pond and it has been much cooler, but i
witnessed my fav fish sucking oxygen last night and have run the air
16 out of the last 24 hrs. They hang out and dash through the bubbles.

Well, Juls, there is possibly the answer to your question above: At night,
green plants do not manufacture oxygen. Rather, they consume it, just like
most other creatures. Without a waterfall or other mechanical means of
getting oxygen dissolved into the water, they can actually starve the fish
for air! Short of that, I know of no limit. Your clear water shows that
your plants are greedily gobbling up all the nitrogen waste your fish
produce, leaving none for algae to eat. Keep that air running, especially
at night, or get a small fountain/waterfall to stir things up, and your
pond should be very happy...

Dave