"matt" wrote in message
...

my pond has been runing for about five months now and with winter coming
i would like to have brought my smaller koi in for the winter, for my
own pleasure and to allow them to grow and be safe.
i believe my larger koi will be fine due to them being in a shallow
pond last winter before i bought them, and mine is a bit deeper so just
gotta hope.

anyway, i was wondering if 13 small koi between 3 and 6 inches would be
hard to manage the ammonia, ph, etc. back when i kept fancy goldfish i
had about a dozen and although i didnt know about the ph etc they were
all fine.

how would i keep these levels at a safe level in an indoor tank, do i
need biological filtration.

thanks


--
matt

I have five Goldfish (3 " to 6") in a 75 gallon aquarium with lots of
filtration and Nitrates are still an issue. So I can't imagine keeping 13
Koi in an aquarium, a large stock tank perhaps. I did keep 9 GF in the pond
last winter and they all came through OK. I did cover the pond and put a
heater (39° F) in the pond though, as the water is only 24" deep.