I think they should be compatible, but the pinktail may get a little large for your tank. If you keep these two, I'd have them as the largest fish in your tank, and fill in with a few smaller fish that are well under 1 foot. Occasionally, pinktails can show aggression, but IME they are fairly mellow. Dogface puffers, also IME, are the nicest of the Arothron puffers, and are almost always very peaceful.