Hakkai Stone (also called Pahai or "bug-eaten" stone) is a dense, smooth, river-worn rock in dark blue-grey-green with natural holes and grooves from years of erosion. A favorite for Iwagumi and riverbed aquascapes.
- Inert: does not change pH or hardness
- Very heavy; order extra weight for several pieces or a mix of sizes
- Natural product: size, shape and color vary; color darkens when wet
- Rinse thoroughly before use