YAMAYA STONE has a unique grayish tone and beautiful texture, which is collected from the mountain valley of Japan. It is an excellent stone to use in combination with driftwood and it can also be used alone. You can just pile them up randomly rather than choosing one individual stone.
This rock is inert and will not affect the water chemistry of your aquarium. Many Yamaya stones are the size of fist, you can just pile them up randomly rather than choosing good shaped ones carefully.
Priced at $4.25 per pound.