A month ago I purchased 2 Japanese koi from the local pond & koi club. Prior to purchase these fish were quarantined, checked for parasites and khv . Once we brought them home I put them in the qt (70 gallons) scraped and scoped them and raised the temp to 80 for a few days to check for khv. I then added water from my main pond everyday at the rate of a few gallons a day until the qt was at about 70% pond water.

Today I added the 2 new fish. At first everything looked good both new fish schooled with the 6 others. About 30 minutes later one of the fish started to isolate and is still isolating a few hours later. The other is doing fine. I'm pretty sure this is not normal but I'm not sure what to do? This is the first time I have added new fish to my pond.

All my levels are great... ammonia 0, nitrate 0, nitrite 0, kh 120, ph 7.6 (always between 7.4 and 8)

Any help would be much appreciated.

Thank you,

--Michelle