I love the soap stone and how you stacked them. It looks like a natural formation. I saw you plan to add giant hair grass (GHG). I added mine to a dry start and it did well. Only thing I would recommend: If you want the GHG to stay localized, you should think of putting a barrier in the substrate - like a pot. They send out a lot of runners and they can travel a long way! I wish I had.
Bill
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