how big (gallons) is your pond?
what is your filter setup?
what are your water parameters?
what did you use to keep a hole in the ice?
Ingrid

(ROMERO) wrote:
I had the same problem, I had all my Kois died, 21 of them. I have them
for 7 years. I livee in Illinois and we had an awful winter, the ice on the pond was
very thick. I never had this problem before. also the water just turn very green, any
idea???. May be I should empty the whole pond. By the way the pond is about 3.5
feet deep.
Thank you.
Cesar