what is a good single fish to add to community aquarium?

I have a 60 gallon aquarium with 10 neons 5 glowlights 2 male guppys 4 rasboras 6 cherry barbs and 2 ghost shrimp. What is a good fish that i could add with them that doesnt need to be kept in a school but wont bully the peacefull fish i have? i should have around 15 inches of fish space left.
I know that gourami's can be added but are there any othe type of fish that is common and not be to hard to find
 
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