I have some considerable experience with this and I can tell you that planted nano tanks are far and away the hardest to maintain. Rather than anything with filtration, lights, etc., I'd experiment with a jar or vase of inert (this is critical) rocks and as many anubias as you can fit. Light levels will have to be pretty low (like nowhere near a window) or you'll get massive algae. MAYBE one small snail will go in this, and it may need feeding. A few shrimp are a possibility, but I'd wait until it's stable for months. It's easy to become a mass murderer of livestock with these things.

It is possible, though, and very rewarding when you get it right.