I am considering going shrimp-only in here now. I have loads of CRS from my breeding tank. I think they'd look pretty cool on the "hillside".
I agree, though don't you feel the amano are a little too big for the scale of the scape.
Why not try some Cardinals, I think the contrast in color would work really well in here. And there are a few people now selling F1 uk bred shrimp.