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Hakkai Stone is a dramatic volcanic rock sourced from the slopes of Japan’s Mount Hakkai. Shaped by ancient lava flows and erosion, this stone is known for its rugged textures, dark coloration, and striking form. Highly prized in aquascaping, it is especially effective in Iwagumi layouts and mountain-inspired scapes, where its bold presence creates depth and power.
Origin: Japan – Mount Hakkai volcano
Water Chemistry Impact: Inert and stable; does not affect pH or hardness (KH & GH)
Compatibility: Great for planted tanks; safe for shrimp, snails, and small fish
Restrictions: Rinse before use; avoid force or excessive stacking to prevent chipping
Aquascape Style: Iwagumi layouts; dramatic mountain-like aquascapes
Placement: Centerpiece stone, rugged cliff builds, or grouped structures
Special Features: Bold volcanic form, dark coloration, rugged detail
Water: Fully inert and aquarium safe
Tank Size: Works in both nano and large tanks; ideal for layouts emphasizing height
Substrate Pairing: Contrasts well with bright sands and plant-heavy soils
Design Tip: Use one large stone as a focal point with smaller companions for balance
Appearance: Rugged volcanic rock with irregular formations
Color: Dark gray to nearly black with subtle highlights
Texture: Rough, fractured surfaces
Impact: Creates bold mountain landscapes with dramatic shadows
Preparation: Rinse thoroughly before use
Placement: Avoid stacking under pressure to prevent chips
Maintenance: Stable and inert; rugged texture may collect algae
Special Tips: Best for high-impact Iwagumi and mountain ridge aquascapes
We ship orders within the contiguous United States. Ready-to-ship orders are processed within 1-3 business days. Please email us regarding the processing time on custom orders.