Koi owners! HELP!?

I had recently bought a small 3 inch koi and a comet gold fish with a common gold fish, both around an inch. They currently live in a 55 gallon tank with a telescope, two ryukins, and a crawfish. I know that the tank is much to overpopulated and small for the koi and goldfish for them to live long and grow big. I didn't before but now I am wondering if it is possible of me to sell them to any pond owners who can provide them the space and life they need to stay healthy and happy.