Why dont you kick out the cories as theyre not that suitable for your tank.
Neons are very low waste producers so you coulg go with 5-6, you will have to cycle the tank first though, or they will die. Some people have been abled too do it though, depends on your dealer and if they have good fish. I think you could do the shoal of neons.
I think the honey gourami will be good, youll have the top of the tank covered. Make sure the flow rate isnt too high for the guy and give him some floating plants.
This would be a good stock up, but you could keep your cories. Its a toss between 2 cories and 1 gourami, or 3 cories and no gourami.
There wouldnt be much space for 3 cories though... this is hard (lol)
6 neons, 1 gourmai and 2 cories seems ok, peple will disagree, but i think 6 neons will produce very little waste and its just a matter of do they have swimming space? Youll also need too watch the paramaters.
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Now, I have heard bettas have an excellent personality, people come from miles just too get them from my lfs and they go like cookies!