Ok, so I was wondering. I have a 5g tank with a bunch of stupid little feeder guppies (supposed to be food, but turns out that dragon gobies don't really like them), I would really like to get rid of the guppies and put some dwarf puffers in the tank. How many could I keep in a 5g? Also I know that they should probably need snails or something crunchy to keep their teeth worn down, since they're puffers, but where could I find snails that small? Or would there be a good substitute for snails that would still keep their little puffer teeth down? Any info would be appreciated, Thanx.