I must (respectfully) disagree with you on this, Sam. By the time the fish
are hanging out on the surface or at the waterfall, they're STARVED for
oxygen, which is nearly too late. Why wait that long? They will grow better
and be much happier with adequate O2 in the water. Mother Nature pulls a
dirty trick on fish: in the summer, when they're the most active and
growing, she yanks the oxygen out of the water because it's warm. Think of
it like trying to run a marathon in Denver without training for it . . .
sorry, there's just not much O2 in the air up there G. Same thing: not
much O2 in warm water. Aeration is like filtration: you can't get too much.

Lee

"Sam Hopkins" wrote in message
.. .
Unless your fish are hanging at the top of the water gasping you dont need
an airstone.

"FBCS" wrote in message
...
I have read lots have natural ponds/VG filter no falls and they do not
talk
of the need for an air pump/stone. How necessary is a air pump/air stone
to
the health of the pond? Do you calculate size by gal with this type of
pump
also. If not what would be a typical size for a pond, better yet, what
do
you use? Joann