Our pond system has 3K gallons in the main pond and 1K gallons in the
berm ponds and barrels. The pond has about 10 koi, full sized, and
about the same number of goldfish. The berm plants do a great job of
handling the muck...growth like crazy and clear water. We have not done
any regular water changes. The toilet valve does replace the
evaporation on a regular basis...MS is very hot. The koi don't seem to
have suffetred any particular problems from the lack of changes. They
have grown like weeds and are 20 to 28". The ratio of koi per gallon is
pretty good. That may help. Jim

Now bear with me, I'm not trying to be a "I know better than thou" here. It
is just I'm trying to prevent my mistakes passing on to another. I, too,
wasn't real good about doing my water changes as the experts suggest. It
finally bit me in the butt, and that is my concern/worry for you. Some of
those experts would consider your situation on the high end of the stocking
rate. Fish are bigger, pond stays the same, all the more reason to follow
their advice.... or, since I'm suggesting it "go not where I have been".
;o) ~ jan

~Power to the Porg, Flow On!~