I have 10gal tank, which is probably 8 gal once you count out the substrate and things. I have two dwarf puffers currently, but they are boring. They're cool when they come out, but thats a big "when". So I probably have about 2 "fish gallons" left depending on how you calculate it, since the DP's seem to need 3 gallons per fish. Any suggestions for really cool tank mates?