a few neon tetras maybe some ghost shrimp and snails. You could add ONE and only ONE dwarf puffer, or like other people have suggested a betta. some guppies would be nice in there, and would get along perfectly with tetras and ghost shrimp and snails, but if it isn't heavily planted I would say only 2 or three guppies and 10 shrimp.
i posed a qestion in a simalar vein a while back in relation to a spare 5g and i went with.......dwarf frogs,there great im glad i got 1(the shop only had 1 left) but a 5g is fine for a pair and a few smaller snail species(nerite,ramshorn)
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