UNS · Stone
Ancient Stone
Iwagumi keepers who like the Manten look and want a slightly darker, more angular stone.
4 models
UNS · Stone
UNS Ryuoh Stone
Sometimes sold as boutique Seiryu, Ryuoh is a charcoal grey stone with white marbling, deep grooves and jagged edges. It is medium weight: lighter than Hakkai, denser than lava.
Updated
Best for
Iwagumi layouts where you want a darker, more dramatic alternative to standard Seiryu.
Worth knowing
Expect it to behave like Seiryu and harden the water unless your own test says otherwise.
What stands out
- 5, 10, 20 and 30 lb lots
- Charcoal grey with white striations
- Clean lines and sharp grooves for Iwagumi
- Solid base for driftwood in nature layouts
Models and specs
| Model | Weight |
|---|---|
| 5 lbRYU0005 | 2.3 kg |
| 10 lbRYU0010 | 4.5 kg |
| 20 lbRYU0020 | 9.1 kg |
| 30 lbRYU0030 | 13.6 kg |
- Brand
- UNS
- Effect on water
- Not stated; Seiryu-like stones usually raise KH and pH, so test before use
- Colour
- Charcoal grey with white marbling
- Texture
- Grooved, jagged edges
- Prep
- Rinse and scrub well before use
Figures from Glass Aqua's product listing. Makers revise products, so check the current figures before buying. Photos supplied by the brand or its distributor.
Compare with
Browse all hardscape
UNS · Stone
Ashen Stone
Minimal or river-style scapes that want bright, soft stone against lush green planting.
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Budget-friendly builds, nano tanks and moss-covered scapes that need plenty of stone volume.
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Black Lava Rock Cave
Shrimp and nano tanks that need hiding spots, or scapers wanting planted pockets at different heights.
4 models
Frequently asked questions
Quick answers about the UNS Ryuoh Stone, drawn from its specs.
Does Ryuoh Stone affect water chemistry?
Not stated; Seiryu-like stones usually raise KH and pH, so test before use.
How do I prepare Ryuoh Stone before use?
Rinse and scrub well before use
Who is the UNS Ryuoh Stone best for?
Iwagumi layouts where you want a darker, more dramatic alternative to standard Seiryu.
Is there anything to watch out for with the UNS Ryuoh Stone?
Expect it to behave like Seiryu and harden the water unless your own test says otherwise.
What are the alternatives to the UNS Ryuoh Stone?
Other hardscape worth comparing: UNS Ancient Stone, UNS Ashen Stone, UNS Black Lava Rock. Add any of them to the compare table to see the specs side by side.