A couple of Updates
I added substrate in two, well three, parts.
The first shot is sand mixed with clay, for iron, peat moss, and worm castings.
Next, I capped with sand. I then added CaribSea Floramax gravel.
The final two shots are with water added. I just have some red root floaters in there for now.
Like to hear about the hardscape and also what low light plants I should use. I'm thinking about a smaller crypt for the sides and back, but I would like a lighter carpeting type plant in the center channel. I'm also not sure if I should put some moss on the rocks, add more rocks, etc>