Description
Ohko, also called Dragon Stone, is an argillaceous rock that does not influence the water hardness, and whose holey structure and warm earthen tones make it an eye-catcher for your aquascape that gives it a very natural impression.
How much you need to order:
Tank Size
How many rock needed (this is for pure rock scape,
divide by half if you are mixing wood and rock)
30 x 18 x 24
Small x 1kg + Medium x 1kg
36 x 22 x 26
Small x 1kg + Medium x 1kg
45 x 30 x 27
Small x 1kg + Medium x 4kg
60 x 30 x 36
Small x 1kg + Medium x 4kg + Large x 5kg
Size of rock
how many pcs
Small
1kg about 7 – 12pcs
Medium
1 – 2kg about 1pcs
Large
3- 5kg about 1pcs
Buying ANS Dragon Rocks by the Kilogram
Selling Dragon Rocks loose per kilogram, from roughly 5cm pieces up to 40cm centrepieces, lets you buy exactly the stone your scape needs rather than committing to a full box. We find this ideal for nano and mid-size tanks common in HDB and condo homes, where one or two well-chosen pieces do more than a pile of small rubble. Ohko, or Dragon Stone, is an inert argillaceous rock that leaves water hardness untouched, so it stays friendly to soft-water shrimp and planted setups.
Our listing gives rough quantity-per-tank-size guidance, but the more useful rule is to pick fewer, larger statement stones and mix in offcuts to bridge them, which reads as a single natural outcrop. If you are blending rock with wood, halve the rock weight you would use for a pure rockscape. Scrub off loose clay before placing, since the soft, holey surface sheds fines that briefly cloud the water until your filter clears them.
See the full decorations range, and read our SG Ohko sourcing guide with our Dragon stone aquascaping guide to plan grades and placement before you order.

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