I personally would take out the rocks because the way they contrast the substrate and future flora will be harsh and unnatural. Since this is low light and a nano tank, plants like Crypt parva and Mini Bolbitis would look awesome! Good luck man!
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In my Fluval Spec, I planted some Crypts since I'm sure they are low light. You might want to look into some low light crypts. I also added a Marimo Moss ball which I ended up using to cover the little hole near the bottom of the wall so any baby shrimp I have won't be sucked in. Just to give you an idea. :]