Kei stone has a warm color, a mixture of ocher and red, and its natural texture that evokes a cliff at a mountain stream. Various sizes from S-L (approx. 4-30cm) are available, and you can make a natural-looking iwagumi layout by combining few of Kei stones depending on the tank size. You can attach ferns and Anubias to S size stones or use them with driftwood.
This rock is inert and will not affect the water chemistry of your aquarium.