I absolutely LOVE dwarf puffers!! I fell in love with them 2 years ago (at the time they were still really rare—had just begun to be imported to the US). At one time I had a lot of them in my 30 gallon. I lost all of them to a disease and it just broke my heart. They were all trained to hand feed, which was amazing for wild caught fish. Now they have begun to captive raise them, which is great.
I currently have just one little guy left, affectionately called Poof. I think I will get him a friend or two but we havent had them in for a long time. And as the demand goes up they have gotten much more expensive.
Their little puff beaks are always growing so they need hard food to eat to keep it worn down. I raise small pond snails (Physid species) and ramshorns (Planorbis species). Malaysian livebearing snails are too hard and can break their beaks.
They also do well with live blackworms and occasionally frozen bloodworms.
Fig 8s are great as well. At work I feed them snails and large ghost shrimp as well as worms. They do get large and aggressive and are brackish, not freshwater. Most of the brackish puffs too turn completely marine by the time they are adults.
The Puffer Net is a great puffer website.

my puffers!!