I had 15 beautiful koi, all about 5 years old. They were very healthy, but the other day I put too much Tetra algae control in their outdoor pond, and now 2-3 of my koi are dying a day.
If I put them in another pond I’m scared I will shock them. i only have five left; they seem to be ok, but they may be a little sick. One is just trying to breathe and swimming on its side trying to get air from the pump.
Is there something I can do to save them all? I put the sick one in a pond by himself just to see if he would get better. I didn’t do anything special to the water. I know I should have let the water sit a while, but I had to do something. I did put a small pump in the other pond. I’m sure I will wake up and find more dead koi. Is there any way to help them?