hey guys. So, my uncle has a pond with kois. All of a sudden one of his koi, around 8" went belly up. It's not dead yet, just belly up and breathing hard, rapidly.... all other kois ate doing just find including two three inchers that i just released in from yesterday. Rn it's in a bucket with an airstone. I added salt, stress coat and a couple of ice cube to cool down the water. No the water is not hot at all. Not even warm. Could you guys please shed some light.... thanks ij advance