Great looking tank, as was the layout before. You have a great eye on the rock woek. The C. parva might pop up in some unxpected places since it still runners. C. lucens might work too....a little bigger but clumps instead of runs.
Total make over. I would go with some moss sprawling on the ground on the right to give some balance to the tank. Moss also gives a really nice feel of rolling pastures and place for CRS to reside in. Or you can just leave it all alone and let it fill in. It ll turn out just as nice.
Alright everyone is wondering how this tank looks I took this picture a couple months ago...The tank is still up and running but all you see is moss right now. Pretty much it has been left the same and I let it do its own thing.