I think I’m going to keep it quite flat I might bank behind the back left rocks with soil so I can grow something quite high up.Potentially very good, I think I'm just struggling to visualise the gradient that you will have with the substrate.
I am wondering about not planting this and going for a trio of shell dwellers just fill in the gaps with shells.... it’s not a lot of water but big footprint so on the fence as to if it could work