The Ohko stone (Dragon Stone) is a rock that resembles dragon scales. It typically has a greenish brown coloring and is very light weight compared to other hardscape stones.
Aquascapers say the Ohko stone is basically composed of hardened clay, which has been known to be very fragile. Even with this downside, the cratered surface of the Ohko stone results in many mini-caves and nooks for anchoring moss and plants alike.
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