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Koi love to nibble on the soft, fuzzy foliage of fairy moss. It floats freely on the surface, shading the water as it spreads to help cut down on algae growth. Its colorful fall leaf display is a great bonus; the foliage darkens to purple-red at season's end. Bring some clumps indoors to overwinter fairy moss in an aquarium or pan of water to replenish the pond supply in the next season. Otherwise, they will freeze and then thaw in the spring.