20 gallon...would like help stocking please

[madaboutshrimp]

My 20g tank finished cycling a few days ago and so far I've got 1 F guppy with her 7 babies and 2 glofish. On Wednesday I'm heading to the LFS to purchase 3-5 more glofish for the tank but I want some ideas on other fish to add eventually. Once the babies get to the point that I can tell whether they're female or male I'm going to keep probably 1-2 females and let the LFS take the rest. So I guess that will put me at what....approximately 8 fish? I'd like to add something else, some happy go lucky docile fish.

Any ideas? I don't really know many different types of fish but I know I don't want Tetras.

I appreciate any and all help given!