Danios do occasionally nip fins of other fish, I would scratch them out and just stick with one type of schooling fish. I would do the neons.
Here is what I would do:
1 betta
3 platies (1m,2f)
3 swordtails (1m,2f)
6-8 neon tetras
5 corydoras (smaller species i.e. panda)
I know you didn't say anything about a bottom feeder, so I added some cories to my stocking list because the fish you presented were top/middle dwellers and the bottom would look bare. Also, they make a great cleanup crew.
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