How do we know that a puffer wants a giant tank?Did someone finding a talking puffer and ask him?I statrted a 2 inch MBU puffer in a 180,he seemed lost and did not eat well.I moved him to a 60 gallon he started to eat and act much better but still was staying in the back.I moved him to a 40 gallon tank and he has been happy ever since.As he grows he will get a bigger tank but i am not so sure about needing more then my 450 in the future.
Good luck with your group.