John,

I move my tropicals in in the winter. If I don't build up the gravel bed
filter by gradually introducing the fish, the bacteria are not up to the
chore and I get an ammonia spike and dead fish. Koi produce more waste, but
the principle is the same...lots of bacterial surface allows ok water.

I use only subsand filters, 1 1/2" of gravel and power heads on my 80 gal
Oscar tank. It does just fine with two full-sized oscars (14" and 12"
oscars). The trick there is that the h20 cycles every 20 minutes.

They do fine with a quarterly change of 1/3 of the water and vacuum picking
up of the muck (small submersible pump pulling muck into an 8" aquarium
filter sponge on its way to the pump). I take out the rocks, cut off the
power heads, stir the gravel and heap it at one end. The muck settles all
over, but especially at the low end. Then I use an aquarium vacuum run into
the scution end of the pond pump to grab the muck. As I think about it, I
could take a digital of the apparatus and send it to you.

Net: Koi should do fine with sufficient filtration...especially a really
good set of bacteria.

Good luck

J

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"john rutz" wrote in message
...
I have been reading about a experimental koi spawning on the british koi
clubs website.
but his experiment was totaly controled

has anyone raised baby koi in an outdoor kiddie pool and if so how much
growth did the fry show and how fast

I dont know whether t leave them in the kp or buy a small aquarium and
move them inside
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John Rutz
Z5 New Mexico

never miss a good oportunity to shut up

see my pond at:

http://www.fuerjefe.com