1 betta or paradise fish (the betta will attack other betta's and any other fish that resembles one) Paradise fish JUMP so have a good hood. do not put those 2 fish together they will fight. Other than those two put some black neon tetras or cardinal or just normal neon tetra's. maybe 2 swordtaills
10g
1 betta or paradise fish
6 neon tetra's
2 swordtails
2 cory cats