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Hi Bob,
We have a 12X16X3 koi pond. Last year I kept a hole in the
pond all winter but still lost all the koi. All the goldfish
managed to survive though. This year we brought the fish into
the basement and placed in a stock tank. We have an air stone
and 1,000 gal filter running but have already lost 3 of the
koi. We seemed to have the problem start when I did a 30%
water exchange. I did use a declorinator. Any ideas as to
what may be causing the fish to die? Thanks for your thoughts.
Dear Polly,
Are you water testing the stock
tank? If your filter is new, and set up with fresh media,
it probably wasn't performing any bioconversion at all.
The only way to make sure you have an active system is to
have the vat system up and running all summer with a small
fish load. Your media should come from the filters in your
pond. Starting up fresh with a load of fish who are still
eating is a ticket to ammonia-flavored disaster. What probably
did it for your critters was a pH
shift as your fresh water hit the water in the tank.
Mass die-offs in tank environments are almost always due
to water quality issues.
Bob Passovoy
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