sounds like aeration is bad. how warm is the water? have there been fast drops in
temp? then look for ich. either there isnt enough air OR something has infected the
gills OR something has burned the gills.
Check water parameters including ammonia, nitrites, nitrates, pH and temperature.
Ingrid

"Gorf" wrote:
no aeration from bubbles, that is done by the agitation of the surface
at the filter return.

The behaviour change is that the koi (only) have suddenly started
resting on a ledge at the surface, whereas before they would be
swimming at the bottom. The goldfish are still swimming about the
bottom.


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