Hi, i have had puffers all the time, they are actually the reason why i had started a saltwater aquarium. while many people tell you what you should and shouldnt do within your aquarium it is up to you. I have kept a couple of puffers together in the past and they did just fine. as it comes to the porcupine puffers i see them all the time at the stores together. i have seen a tank with at least 8 porcupine puffers together. I have had the mini puffers, dogface puffers, burrfish, porcupine, golden and more so i dont think you should have any problem. i would just make sure you pick the sizes carefully. make sure they are about the same size. and try to introduce at the same time. Hope this helps