well it depends on if you want larger fish or if you want to stay on the small side. well here are some suggestions. if you dont like these let me know what you are looking for.
SMALL FISH: cherry barbs, guppies, cories, danios, white clouds, rummy nose tetra, black neon tetra, macmaster's dwarf cichlid, cockatoo dwarf cichlid, rams, dwarf gourami, zebra loach, threadfin rainbowfish, celebes rainbowfish, peacful betta
Medium-Large Fish: clown loach, blue gourami, giant gourami, chocolate gourami, red line torpedo fish(might be too big for your tank), silver shark, clown rasbora, sliver dollar, slender betta, pearl gourami, golde opaline gourami, rainbow fish, skunk loach, butterfly fish, mono fish, swords
hope that helps! ask if you have questions