Neons? gag me. That little tank would be great for some bumblebee gobies and a dwarf puffer (yes that's freshwater for all you reef onlyers out there)

. Get some harlequin rasboras if you want tetras, their color lines would shimmer pretty nice in the spotlight of that tank. Cherry shrimp would be cool too, just not with the puffer and gobies, that would not be pretty.
I'm not blasting what you're doing, I'm just saying that you could do way better than neons... Why settle for the moon when you could shoot for the stars?... Just my opinion.
So, what kind of plants are you considering? I'm not sure what the wattage of that light is.
Overall it's a intriguing tank, good luck with it.