Strictly speaking, all iwagumi displays use rock as the hardscape.
But applying this concept to aquariums and the carpeting plants is a stretch already, but the method works very nicely and dramatically.
One of my biggest complaints is the lack of high grade rock in the USA, while ?I can buy it from an ADA vendors, the cost is prohibitively high given the amount of materials I like to work with.
The weight is often an issue also. Larger pieces can weigh up to 50-70 kg.
I have a lot of wood and the Manzy tree is very interesting in the stump bases that protect the tree's from frequent fires. These burl bases are very interesting and rock like in character.
This uses only HC and this is day 1. I'll try and give weekly updates on this.
I still have a rock on one piece of wood to weight it down. They HC got a little melted that I got, but should be fine.
I will switch the lighting this week weekend coming up to an ATI 6x 39W with a dimmer and set the intensity to 60-75 umol on the top rear and about 50 at the lowest front section.
I will have the option to drive the light levels much higher, but ........HC trimming is not as easy as Gloss trimming.
There is no rock except for the Petrified piece I collected in this tank. It's all clay ADA AS and wood and plant.