Of the puffers I would have suggested not to try this with (besides a Mappa/Stellatus), were the Porcupine and the S&S. However those previous stories of failure were either of them were mixed with less aggressive ones, dogface, burrfish, etc. For the time being, I believe they will be fine. However the Porcupine will eventually reach maturity and then I believe problems will arise, as they develop such a jekyll/hyde personality. I have seen Porcupine's bite yellow tangs, taking out most of their back, completely out of the blue.