Black Seiryu Stone (also known as Dark Seiryu or Dark Ryuoh Stone) is a premium, high-contrast aquascaping rock featuring deep charcoal-to-black base tones interspersed with striking white calcite veins. Known for its sharp, craggy texture and jagged mountain-like contours, it brings dramatic scale, depth, and immediate visual impact to planted layouts, Iwagumi aquascapes, terrariums, and paludariums.
Black Mountain Seiryu | 2.5KG
Black Mountain Seiryu | 2.5KG
Important note: This is a natural stone, being natural we won't be able to give you the exact pattern shown in the listing. We will pick random sizes and patterns equal to the weight you have purchased. For sizing, see details below.
sizing details
To request a specific rock size (Small, Medium, or Large), please leave a preference in your order notes at checkout or send us a follow-up email after placing your order. Size requests are fulfilled based on current stock availability. You are always welcome to contact us before ordering to confirm real-time stock levels for your preferred size.
LENGTH (AVERAGE)
Over 20cm
WEIGHT REQUIREMENT
Average stone in this size weighs upwards of 2.7kg. A minimum order qty of 2 amounts may be required for a single piece.
NOTE
Actual stone will vary from the images shown. As a natural element, exact colors, shapes, weights, and dimensions may differ slightly from the specifications listed above.
medium
LENGTH (AVERAGE)
15-20cm
WEIGHT REQUIREMENT
Average stone in this size weighs roughly 2-2.5kg. A minimum order qty of 2 amounts may be required for multiple pieces.
NOTE
Actual stone will vary from the images shown. As a natural element, exact colors, shapes, weights, and dimensions may differ slightly from the specifications listed above.
small
LENGTH (AVERAGE)
Under 17cm
WEIGHT REQUIREMENT
Average stone in this size weighs up to 1.1kg. One qty is sufficient for at least two pieces.
NOTE
Actual stone will vary from the images shown. As a natural element, exact colors, shapes, weights, and dimensions may differ slightly from the specifications listed above.
Transform your aquarium with authentic, wild hardscape materials from Aquatees. We supply thousands of kilograms of naturally sourced aquarium rocks, premium driftwoods, Tweety wood, and fine sands—bringing raw, untreated nature straight to your tank. Because our hardscape is harvested directly from the environment, simply give your pieces a brief rinse to remove natural dust before building your dream aquascape.
Black Seiryu Stone is a dense, heavy rock, so individual pieces often weigh more than they look. For a standard aquascape or Iwagumi layout, a good rule of thumb is 2 kg of rock per 10 liters of tank capacity to ensure you have enough main centerpieces and smaller accent stones to build depth.
Yes. Like normal Seiryu Stone, Black Seiryu naturally contains calcium carbonate, which slowly leaches into the water over time. This will gradually increase both your pH and your water hardness (GH and KH).
Yes, provided you manage the water chemistry. While many tropical fish and plants prefer soft, slightly acidic water, you can easily offset the hardening effect of Black Seiryu Stone with regular water changes, using RO (reverse osmosis) water, or using an active aquascaping soil that naturally buffers pH down.
At minimum, give it a thorough rinse with fresh water and scrub away any surface dirt or clay trapped in the crevices. Some aquascapers choose to perform a brief muriatic or citric acid bath to clean deep crevices and highlight the white calcite veining, though a simple freshwater wash is all that is required.
Yes. When submerged under tank lighting, the base stone darkens to a richer charcoal-black hue while its distinct white veins stand out with even sharper contrast.
