And how much agitation is there in the surface of the water where the pump
returns water back to the pond?? You can have the largest pump available,
but if the return is BELOW the water line and there is no surface agitation,
then you are not getting very much carbon dioxide/oxygen exchange in your
water. Make sure the pump is big enough and the water surface is being
agitated.

--
G.D.Smith
Harpers Ferry, WV

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"Courageous" wrote in message
...

Koi do this when there is not enough dissolved oxygen in the water. It is
a sign you are not moving enough water through your pond.

Your pump should be 2500GPH or more. How big is your pump? What's its
source? What's its destination?

C//