I have 2 Porky's in my 240. Tank mates are foxface, lunar wrasse, Snowflake Eel, Fiji Damsel, Whitecheek tang (Until I can catch and remove him), Huma trigger, blue throat trigger, and yellow tang. Also a few big hermits.
Edit: Forgot to say both Porky's are about 4-5". I've had the 1st one since he was about 1.5", and added the 2nd one a few months ago. He was just a little smaller than the one that I already had.