Picture of the fish swimming on all levels of the tank with the addition of the Zebra Danios.
The Zebra Danios actually made the neon tetra more brave and swim high and around the tank more.
Current stock (maybe a tad overstocked, but not too bad):
8 Zebra Danios
16 Neon Tetra
6 Peppered Cory Cats
6 Amano Shrimp
Cats on the bottom, Neons in the middle and Danios at the top.