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It's a funny thing- Japanese breeders feed floating pellets to get a look at the condition and general well being of the koi. They feed sinking pellets to reduce the predation of the fish. And that is really the only purpose or difference.
It was Hikari foods that first created the floating pellet so that hobbyists could see their koi better in murky and green ponds of the day.
The only difference is how they are extruded and how many air pockets are left in the pellet to make it bouyant. JR
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