Select Rocks with a Uniform Texture
Mantenseki has become easier to obtain and therefore more recognizable.
Rocks should be selected not only based on their shape and size, but also for the uniformity of their texture as well.
Mantenseki are well recognized as standard rocks for an Iwagumi layout among the fans of Nature Aquarium. The supply is stable at present and a variety of sizes are available at shops. The rock is often thought to lack variations in the expression as compared to other type of rocks, but this is not true. The basic rule is to use the rocks with the same texture for all the rocks, from Oyaishi, Fukuseki, and down to Soeishi. Otherwise, the group of rocks lack uniformity and look unnatural together. The two Iwagumi layouts above are both arranged with Mantenseki. The aquascape (Photo: Top) was created with rugged Mantenseki with sharp edges whereas the aquascape (Photo: Bottom) was created with rounded Mantenseki. Although many rocks are used, both layouts have natural and cohesive appearances since their rock arrangements are made of Mantenseki with uniform textures.
This layout was planted with Willow Moss and Cobra Grass to accentuate the details created with the small rocks. The slightly visible rocks that are almost hidden by the aquatic plants add depth to the scenery.
The appearance of the aquascape right after Mantenseki were arranged. The small rocks were placed in the foreground to articulate details, and the small rocks toward the back add perspective.
Top: The surface of a relatively rare Mantenseki with a rounded shape. When slightly covered with algae on the surface, it will have an appearance more settled in the life underwater.
Bottom: A fast swimming Slender Tetra goes well in panoramic scenery with a wide, open space.
An Oyaishi should be selected first, and then other rocks with the same or similar texture. When selecting an Oyaishi, check if there are other rocks that can be arranged with it.
Top: Since Mantenseki is not a river rock, many of them tend to have this type of rough surface. However, their appearance varies greatly.
Bottom: Green Neon Tetra with subtle hues goes well with the combination of warm-colored Mantenseki and Hair Grass.