Do you mean tropical fish? If so a good selection would be a few neons, some tetras (there are quite a few to chose from. Have a look in your pet shop and see which you like.) Zebra (or leopard) danios, guppies, swordtails, mollies and corydoras. Most of these are happy in small shoals. Keep away from Paradise fish, gouramis, Siamese fish,and barbs as these tend to be more aggressive and some would even kill the other fish. There are plenty of websites on google. If in doubt ask at your pet shop.