Puffers in general, and DPs in particular, are quite nippy. Most folks who have tried have Corys with nipped dorsal and caudal fins. But very little is 100% predictable with puffers.
I had mine in a 10g with 2 panda cories. My puffers seem to be pretty tame and live happily with shrimp, otos, khulis, and BB gobies, BUT they nipped up the fins of my cories. So, IME the cories wouldn't be safe with the DPs, but differnt DPs have differnt personalities. I did only catch one ever nipping them, though, so maybe it was just one troublemaker and the rest would have been ok.
Thanks for the Welcome! And many thanks for your advice. Had this tank running for about two years until unfortunatly my miurus died i decided to go for dwarfs, anyways from what i hear i guess it best to leave them out, they also currently about 1cm BIG lol