By Takashi Amano
Unzan-seki stones are a new layout material in the Nature Aquarium, as explained in the June 2012 issue of TFH.
The way that the willow moss was attached to the surface of unzan-seki stones is quite unique. Willow moss was chopped into tiny pieces with a kitchen knife and rubbed on the surface of the unzan-seki stones. Chopped willow moss pieces will remain in the numerous depressions on the surface of unzan-seki stones and gradually attach themselves to the stones naturally.
You can watch exactly how the tank was set up.