The first year on the big pond it was the filter of all filters, or so I
thought, a bubblebead. The next year, I was getting too much particulate,
that was clogging the filter too often, so I added a turbovortex, since
removed. The next year it was a regular vortex. Last year it was a larger
bead filter added. I also have a veggie filter, a trickle tower filter, and
up flow gravel filters on that one pond. The number of fish has increased
to about double, and the average size of the fish has doubled. That
translates into somewhere around 15 to 20 times the waste load that I had
when the pond was built.
--
RichToyBox
http://www.geocities.com/richtoybox/pondintro.html
"seed lover" wrote in message
om...
"RichToyBox" wrote in message
news:xwGgc.24003$ru4.20587@attbi_s52...

[ . . . ]

You did not give any information about the second fishes condition.

The second fish had a symetrical lesion on its left side. My roommate
discovered the dead fish while I was out of town, so I didn't
experience the event first hand.

It may be advisable to go to http://www.akca.org/ and see if there is a
local koi club and a contact.
Most of the koi clubs have a health hotline or koi health associate that
is
willing to come and look at your fish and do the necessary microscopic
evaluation for any needed treatment. You also did not give specific
information on the ammonia level, nitrite level, KH or pH.

Your pond is pretty small for koi.

I guess I have to do some serious thinking about how to proceed,
vis-a-vis my pond population.

I have over 4000 gallons in my larger pond with about 25 koi that will
average close to 24 inches each. The rule can be violated with enough
filtration, but the smaller the pond, the faster it changes from good
water
to poor water.

How do I make my pond filtration more agressive? What can I do to
retrofit the existing set up?


--
RichToyBox