I hope someone with more experience will help out more, since I am pretty new to keeping fish, but here are my thoughts: I am not sure if it is a good idea to mix puffer fish with such slow moving and slow eating fish like gobies... the 2-3 dwarf puffers would already require the 10G tank themselves. Also, if you mean the commonly seen dwarf puffer, it is actually a fresh water species of puffer. I tried to keep them in a community set up, and it failed miserably... now they are happy by themselves. I can not even keep shrimp or otos with them, although some people seem to have more luck with this combination. Mine just hate everything that moves, except the other puffers... they do not show agression towards each other, only at feeding.