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If you want a unique stone to add to your aquarium waterscape, consider the blue-grey Seiryu rock. Originally from Japan, this type of rock is distinctive due to its jagged ridges and white veins. Takashi Amano, the founder of Nature Aquarium, was one of the first to use this stone in his aquascapes, showing how to build spectacular scenery with these unusual options. Learn more about this stone at Modern Aquarium.