other fish for a cycled 5 month old 10 gallon fish tank?

a couple of my other fish died, so ive been hoping for some new ones after a clear the tank of neon tetra disease(see my question about the neon tetra disease in my fish tank). i currently have one neon tetra(others passed:() 2 danios and 1 mystery snail. could i include a betta? i prefer hardy fish and am just a beginner. thank you!
This is not about ebay!!!!!!
 
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