Could I add two more neons?

Bryon to the rescue again! Thank you Byron!!! 🏆
 
No I don't, but I would make some provisos. The live plants including a good cover of floating plants ismandatory. As are substantial weekly water changes. And feed minimally.

But going one step farther, I would leave out the cherry barbs more for my own personal reason. Barbs in general do not go well with these other fish nor smaller tanks, but the cherry should work with my provisos as they are less aggressive and less active than barbs in general.
Thx Byron but what do I do about the top layer?
 
Thx Byron but what do I do about the top layer?

I assume you mean, fish for the upper level. You must understand that you have selected more fish than you should have, because the species need more of them. There is certainly no room for more fish of any different species. I frankly would re-home the cherry barbs, then the other species increased to 10-12 would be much better.
 

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