i dont think 7 dwarfs, while about 7 would fit, the aggression is too high i would have thought. a trio would look good, maybe 4 if there bought together. like J4MES said, lots of plants,rocks, caves etc.but read up about them, they need good water quality and can be hard to look after.figure 8 puffer would fit, 10gallon is the mim. recomended. but their is some debates over if its a brackish or freshwater, personally mine have lived in fresh and thrive. plus in the wild, its freshwater they come from, a figure 8 puffer, and a shoal of freshwater bumblebee gobies would look prett cool.
other options for you are, a group of female bettas, killiefish, cichlids.
plenty others, but cant think of any right now. have a look at a few fish places to see what u like
