My Kois had spawn again for the third time in three years.
Actually I force or induce them to spawn this time.
Took out other kois except for three biggest one. One of them is a butterfly.
Set the heater to 74 degrees.
Now five days later, ten thousands eggs in the 75 gal tank.
Looking at the eggs, it seems like only 3-5 percent unfertilized.
Added a some antifugus drops, hopefully this helps.
Bad news is lots of work ahead with hatching brime shrimps and feeding.
I am already so busy with feeding five different tanks now.
Pondandfish