UNS · Stone
Ancient Stone
Iwagumi keepers who like the Manten look and want a slightly darker, more angular stone.
4 models
UNS · Stone
UNS Ohko Dragon Stone
Ohko, better known as Dragon stone, is a light clay-based rock with a scaly texture in brown and golden orange. It is easy to stack, easy to break into smaller pieces, and one of the few natural rocks that leaves water chemistry alone.
Updated
Best for
Beginners and shrimp keepers who want a characterful, inert stone for nature or Iwagumi layouts.
Worth knowing
Fragile and dusty, and clay trapped in the holes can cloud a fresh tank if not rinsed out.
What stands out
- 5, 10 and 16 lb lots plus a 2 lb bag of small accent pieces
- Warm brown and orange scale-like texture
- Lightweight and easy to break down
- Nooks for moss and shelter for shrimp
Models and specs
| Model | Weight | Piece size |
|---|---|---|
| 5 lbDRS0005 | 2.3 kg | – |
| 10 lbDRS0010 | 4.5 kg | – |
| 16 lbDRS0016 | 7.3 kg | – |
| Accent pieces (2 lb)UNDAS031 | 0.9 kg | 2.5-7.5 cm |
- Brand
- UNS
- Effect on water
- Inert
- Colour
- Brown and golden orange
- Texture
- Scaly, cratered, clay-like
- Origin
- China
- Prep
- Rinse well; pockets hold clay and dust
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.
What dragon stone does to your water
Inert. It does not measurably change pH or hardness, so it suits soft-water tanks, shrimp and blackwater scapes without any of the buffering that seiryu brings.
Full Dragon Stone guideCompare with
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Minimal or river-style scapes that want bright, soft stone against lush green planting.
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Black Lava Rock
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 Ohko Dragon Stone, drawn from its specs.
Does Ohko Dragon Stone affect water chemistry?
Inert.
How do I prepare Ohko Dragon Stone before use?
Rinse well; pockets hold clay and dust
Who is the UNS Ohko Dragon Stone best for?
Beginners and shrimp keepers who want a characterful, inert stone for nature or Iwagumi layouts.
Is there anything to watch out for with the UNS Ohko Dragon Stone?
Fragile and dusty, and clay trapped in the holes can cloud a fresh tank if not rinsed out.
What are the alternatives to the UNS Ohko Dragon 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.