Yup exactly what ladyonyx said but try to keep them in odd numbers. That way if there's a bully, the other two or 3 can't be constantly being bullied by that fish.

As you see in my signature I have 3 in my 75 and they get along fine

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75 gallon:
8 Black skirt tetras
5 Red minor Tetras
5 neon tetras
2 Angelfish
1 8" Hi Fin Spotted Pleco
6 cory cats (emerald, spotted, albino)
3 amazon puffers

2.5 gallon:
Male Betta!

150 gallon saltwater:
In the works!