If I'm doing my math correct that means its 138g? That's huge!
Just remember that fish at the LFS
will be very dull. They will be stressed out causing their colors to fade.
Have a look at harlequin rasboras. They are my favorite. They get a nice red color. IMO
red phantom, cardinal, rummynose, von rio, ember, flame, glowlight, lemon and serpae tetras all have great coloring. There are fish like platys, mollies and guppies also. If you stock accordingly then you could have a betta or a dwarf gourami. Rainbow fish are quite nice also. A small species maybe ok. There are black as well as striped kuhli loaches and cories come in many different colors, even green. There are some very stunning types of shrimp out there also.
Best advise I can give is to do lots of research. Have a look online and at your local fish shops and write down the kinds you like. Then you can research them and ask here on AA. Community tanks are fun to stock but you just have to make sure everyone is going to get along.