I've never kept dwarf puffs but from what I hear they are very territorial and agressive, they say you would have the best success with 1m 2f ratio so thats good but they may even attack and kill each other apparently, the best success for tankmates with them is dwarf plecos, but give it a shot, just make sure the tank has lots of hiding spots and plants, also puffs need shelled food every once in awhile to keep their beak/teeth? trimmed.