Stocking ideas for a 20 gallon long?

[Tropical]

I have a 20 gallon long tank that currently only has 4 neon tetras (the rest died a while ago).

I used to have a school of corys, more neon tetras, and a german blue ram, but the corys dropped like flies (bad stock) and the GBR died of what I could only guess was hexemita.

I'm thinking of getting 4 more neon tetras, and possibly a centerpiece fish, maybe a betta or another GBR.

Any ideas or suggestions?

I'd like to keep this a relatively simply tank, somewhat colorful, but natural as well.

 

[Jconner3]

How about a gourami of some sort? One of the dwarf variety or even a pearl. Then maybe another small school of something or more neons.

 

[Samzter]

Here's what I think:
8 neon tetras
1 pearl gourami or a pair of GBR
6 harlequin rasbora or chilli rasbora.