I can't see why two cherries couldn't go in there!
I'd raise the water level a little. A neat look for a little tank like this might be a small rooted floater covering the whole tank.
Thanks, I am looking to try to increase the water level as the plant acclimate and fill in more, but not sure if going much higher would loose a balance with the bowl. I'll play around with it when I do the next wc and see how 2/3rds full looks.
I still plan to add in a piece of dw before adding shrimps too, and I have some red rooted floaters in my nano that could be added to the bowl if it helps. Would they be a little too competitive for the nutrients in the bowl though?