Hi yeah black neons are quite a large tetra you would be better off with green neons but I dont think that the edge is big enough to hold two types of schooling fish I would do it like this - a single or small group of feature fish + 1 school of 6 and then a group of the shrimp.
The fish from the list I gave that are schooling fish are these
Galaxy Rasbora
Danioin Draculonela (spelling)
Danio Esthrymicin (spelling)
Green Neon Tetras
Ember Tetras
Rosy Loaches
Dwarf Striped Loaches
Ottos
This means that a minimum of 5/6 should be kept in the tank in the wild these fish are founds in groups of hundreds so to make them feel totally confident and stress free in the tank need to be kept in as large a group as possible to avoid problems.
Wills
The fish from the list I gave that are schooling fish are these
Galaxy Rasbora
Danioin Draculonela (spelling)
Danio Esthrymicin (spelling)
Green Neon Tetras
Ember Tetras
Rosy Loaches
Dwarf Striped Loaches
Ottos
This means that a minimum of 5/6 should be kept in the tank in the wild these fish are founds in groups of hundreds so to make them feel totally confident and stress free in the tank need to be kept in as large a group as possible to avoid problems.
Wills