Sera Koi sticks energy plusEnergy food with 4% spirulina for Koi and other pond fishsera Koi Sticks Energy Plus Nature is the energy food without dyes and preservatives for Koi and other pond fish at water temperatures above 17C (63F). It is a perfect addition to natural food present in the pond during the warm season (insect larvae and herbal matter, among others). Valuable wheat germ and 4% spirulina support healthy development and colorful animals. Other types (e. g. sera