I switch he was eating new life pellets for a little bit and now he's eating spirulina veggie fish flake foods then for awhile they ate pellets, now they are back on the spirulina veggie foods.
but this didnt happen before, and this inccident happened after they went back to the the falke foods not after the switch.
I'm sure he'll be fine. He's probably playing koi so that a subdominate male will try to take him down so he can tear him to shreads. That's it, he's just bored.