Koi/Carp feed extruder fish pond farming business HKF is a full time Koi Farm in Hanover, PA. We have more Koi & Butterfly Koi than you've ever seen! Better Koi, Better Health, Better Selection. We offer a full supply of Koi and pond supplies including Koi food and medications, pumps, filters, waterfalls, skimmers, UV lights and water treatments.