Thanks for the quick respond Nancy.
Talked to the koi dealer just now, he has no idea beside recommend treating for fin rot problem. This symptom was fast, I did not see the fin rot on the fish last night, this morning something is eating away on the top fin of the body on one fish and white spots on another. Learned a hard lesson, I'll take the shotgun approach as the fish may die soon.
Any idea about the affect of turning off the UV during the treatment for 7 or 8 days?
Thanks
Andrew
