my kois are dying I need some one to tod me wat to do I or ready did water change ph is good ammonia is 0 plese please I don't know what else to do

Gosh I'm sorry no one has answered. I'm not an expert on sick koi, but you could take one of the dead koi to to a koi store and see if they can advise you.

Another option is to post in the pond forum or try the koiphen forum. I had a bunch of koi die when I introduced a PetSmart koi.

My last koi pond had a complete die off EVERY year, and I could not find a solution as every water test came up ok.

Then one night I went out and smelled a strong odor I had smelled many times but never at my house, it was the county dump burning off methane from their gas scavenging system in the garbage heap several miles away.

The next morning all my Koi were dead.

I live in So. Fla. and the prevailing wind is VERY rarely from the south where the dump was in relation to my house.

I believe I found the solution. From then on I only bought comets and every year had a die off.

I mention it because if your water has tested good, and it's aerated your problem may be environmrntal.

Ask your neighbors if they have sprayed for insects, if the county has a mosquito spraying program or any herbicides could have been sprayed nearby.

Probably a baterial infection. Have you taken the sick ones out and put it in a aquarium and had a good look at them? This antibiotic will cure them of any/all bacterial problems if that is whats causing the die off. They use it in farm raised fish and the aquarium hobby. Its very good, and safe, my favorite antibiotic (im a fish disease guy, just interesting to me) http://www.kensfish.com/aquarium-supplies/fish-food-feeders/kens-premium-sinking-pellets-oxytetracycline-25mm.html