Shrimp - It's basically a gamble with shrimp. Some dwarves don't even notice them, while others will rip them to shreds within minutes! I have had a great deal of success keeping Amano Shrimp with my Dwarf Puffers so far, but I know that as soon as the puffers find out the shrimp are tasty, that will be the end of their peaceful coexistence! I would suggest buying some ghost shrimp from the local fish store and giving it a shot. Ghost shrimp are a very inexpensive feeder food, so if your puffers eat them, you're not out much money and the dwarves have gotten a great meal out of it. If they don't eat them, then the shrimp will make an excellent "cleanup crew" for your puffer tank.... scavenging the bottom and cleaning up any leftover food.