Thank you all, I was just trying to be clever. This is just the start, I will be adding more.
What is planted for now is the "bio falls" (G). I'm planning to plant the media box by adding a mesh bag of substrate.
I asked "what can I grow here" to sfbaaps members growing emersed plants, and Neil Shieh answered me to grow moss.
Originally Posted by Neil Shieh
You could grow mosses provided that some of the moss stems can wick water to the rest of the plant from the water outflow. You could grow any of the common mosses such as java, flame, xmas, etc. you could try sandwiching the moss between the attachment and the outflow and have the moss grow out of it.
A neat idea would be to grow purple bamboo in your HOB! they'll grow right out and they look nice