For the Serious Koi Keeper Only! Hikari is known for "over the top" quality when it comes to Koi Foods. Hikari's Wheat Germ is fed in early spring and fall when the pond water is cool. It's more easily digested than koi foods packed with protein. It is available in 3 sizes of floating pellets. Mini is for the "babies" of the pond. The Medium-sized pellet is for the majority of the koi (and goldfish) out there and it's comparable to the size of M-Wheat's pellets. The Large pellets are for jumbo koi. The quality is the highest on the market but it does carry a hefty price tag. For excellent nutrition at an AFFORDABLE PRICE try the M-Wheat. If you want the absolute BEST QUALITY (and price is not as much of a concern) the Hikari Brands of Koi Foods are for you.