This is almost exclusive to the puffer forum. I see the "you'll stunt that fish if you don't give it a 1000g" explanation at every turn. Unfortunately (as I've stated before), people tend to regurgitate information based on opinion without realistically looking at the reasons.
While I agree that the fish grows to a large size (26.4" TL on fishbase) and requires a large volume of water, the CONSTANT lack of evidence other than conjecture is disheartening.
And while I respect PP's opinion and specialized attention to puffers, I don't think "wait for PP to get here and explain it" is a valid response. Many times, PP references her own site articles (nothing wrong with that, I guess), but if the information was brought into the MFK environment, they may be scrutinized a bit more and a good dialogue would be healthy.