I have a species tank with Both Brazillian and Dwarf (i think!!...they are Little & yellow) Puffers, Initially I started out with 6 Brazillians' and 8 Dwarf's.... after about 4-5 months I now have 5 Brazillian and 2 Dwarf Puffers.
I would like to say that they past away of natural causes....but I'm yet to find a dead one, they always seem to be consumed before i realise one is missing. I havent witnessed any aggression towards each other, except for the usual squabbles at feeding time.
All of my puffers feed on Flake food, sinking pellets, Frozed bloodworms and on the odd occassion shrimp.
Cheers,
Jared