Well, after watching the neons hide away and the pygmy cories dart madly behind things every time I walked by, I decided to add a larger dither fish in the form of a koi HMP betta. It has been a week and what a change he has made in the tank - all fish are now out swimming front and center all day long. Hopefully he won't jump - he seems pretty chill but you never know. He's not bothering my larger shrimp, but I'm guessing that all baby shrimp will become betta snacks. I'm happy there is now activity at all levels of the tank.