I had a blue spot and southern puffer and well it at first they were trying to fake each other out and after a week they shook fins and were all good after that. Guess it just depends on the puffers themselves.
I have a Starry Puffer and I'm hoping to get a Porcupine Puffer so I have I don't have any issues. I have a small 55 Gallon tank but definitely will be upgrading when the start growing.