I do not specifically have a dogface puffer, but I can tell you about it. It is a pretty peaceful fish, requiring to be fed a variation of meaty, frozen foods such as krill, squid, prawn, clam, and shrimp. They will not get any larger than 7 to 9 inches, so if you keep the bioload light in your 72, one for that tank would be fine. If you decide to get a smaller one, he may only take to live food at first. Their not anything like lionfish, but they definitely prefer live foods such as ghost shrimp and blackworms when they are babies.