This is true. If you have an extra 20 gallon laying around you can put a small p in there until he is 5 inches or so and then upgrade to a 55 or 75 gallon. I have a 4 inch spilo cf in a 20 gallon and he has been in there for about a year and a half. I plan to keep him in there for at least another year.
There are no P's that can be housed in a 10 for life. RZ suggested wimples, but even if they could be housed in a 10, they are not P's. I would say that no P would be able to be housed in anything less then a 30-40 for life. Any fish can be crammed into anytank, but it will not be healthy nor happy.