Aquascaping With Dragon Stone Only: Textured Ohko Rock Layouts
Dragon stone — also known as Ohko stone — is arguably the most popular hardscape rock in modern aquascaping, and for good reason. Its deeply eroded surface, warm clay-orange colour, and lightweight nature make it a dream to work with. An aquascape using dragon stone only strips the layout down to rock and plants, creating dramatic cliff faces, mountain ridges, and canyon formations without a single piece of wood. This guide from Gensou Aquascaping at 5 Everton Park, Singapore covers selection, arrangement, and planting techniques for a stone-only masterpiece.
What Makes Dragon Stone Special
Dragon stone is a sedimentary clay rock with naturally formed holes, ridges, and cavities created by erosion over millennia. Unlike seiryu stone, it does not significantly raise water hardness — a major advantage for soft-water planted tanks and shrimp setups common in Singapore. It is also remarkably light, roughly half the weight of granite, which means you can build tall, dramatic formations without overloading your tank stand. A 60 cm iwagumi layout might use 8-12 kg of dragon stone, adding only 4-5 kg to total tank weight compared to 8-10 kg with denser rocks.
Selecting Pieces at the Shop
Not all dragon stone is equal. Look for pieces with deep, interesting erosion patterns and natural crevices large enough to tuck small plants into. Flat-bottomed pieces are invaluable as base stones — they sit stable without needing to be propped. Avoid pieces that are uniformly round or lack textural detail. In Singapore, dragon stone is widely available at aquascaping shops and online for about $3-$6 per kg on Shopee and Lazada. Buy more than you think you need — having 50% extra allows you to audition different combinations before committing.
Layout Principles
A dragon-stone-only layout follows the same compositional rules as any iwagumi or stone-dominant aquascape. Place your largest, most visually striking stone (the oyaishi, or main stone) off-centre, angled slightly toward the viewer. Support it with a secondary stone (fukuishi) at roughly two-thirds the height, and fill in with smaller accent stones (soeishi and suteishi). Odd numbers of primary stones create more natural tension than even groupings.
Dragon stone’s texture invites vertical stacking. Pieces can be glued together with aquarium-safe epoxy or superglue to create towering cliff faces impossible with denser rocks. Build upward confidently — the light weight keeps the centre of gravity low even in tall arrangements.
Creating Planting Pockets
The natural holes and cavities in dragon stone are perfect planting spots. Fill deeper crevices with a pinch of aquasoil held in place with a small plug of filter wool, then insert Bucephalandra, Anubias nana petite, or small fern portions directly into the pockets. Over time, roots grip the rock’s porous surface and the soil becomes unnecessary. For a cleaner look, skip the soil entirely and superglue epiphytic plants directly to the stone — they attach faster to dragon stone’s rough texture than to smoother rocks.
Foreground and Carpet Pairing
The warm orange-brown of dragon stone contrasts beautifully with bright green carpeting plants. Hemianthus callitrichoides (HC Cuba) growing around the base of the stones creates a classic meadow-and-mountain effect. Micranthemum “Monte Carlo” is more forgiving and achieves a similar look with less demanding light and CO2 requirements. For a low-tech approach, Eleocharis species (dwarf hairgrass) provide a grassy foreground that softens the stone edges naturally.
Dealing With Clay Dust
Fresh dragon stone releases fine clay dust when submerged, clouding the water for 24-48 hours after initial setup. Rinse each piece under running water and scrub with a stiff brush before placing it in the tank. Some hobbyists soak the stones overnight in a bucket, changing the water twice. Even with rinsing, expect slight cloudiness on day one — your filter will clear it within a day or two. Do not mistake this harmless clay sediment for a bacterial bloom; it settles quickly and does not affect water parameters.
Maintenance and Long-Term Appeal
A dragon stone layout matures beautifully. Biofilm and a thin layer of green algae gradually colonise the stone surface, muting the raw orange colour into a more natural, weathered tone. Mosses planted in crevices fill in slowly, softening hard edges. Resist the urge to scrub the stones clean during water changes — that patina is what transforms a fresh arrangement into a landscape that looks like it has existed for years. With patience, a dragon stone aquascape becomes one of the most visually rewarding styles in the hobby.
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5 Everton Park #01-34B, Singapore 080005 · Open daily 11am – 8pm
