06-21-2013, 01:16 PM
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The number of tetra (characins) that are similar in size, temperament, needs to the neon is immense--just check the fish in our profiles under characins. Characid Species
Beyond these, there are several rasbora species. They are under the cyprinids. Cyprinid Species
Given that this is only a 65 liter (around 17 gallons) tank, I would not consider any danio or barbs as they need more space being more active, and most get largish too.
Some of these will need more specific water parameters than others, as many of the small fish are wild caught. These are noted in the profiles.