I agree AmazonTankz and can relate. A lot of times its a case of money. Not everyone can run out and buy a 200+gal tank plus all the proper equipment right off the bat. I've got 3 Colombians, and am slowly working up to getting them into a tank to whose their full size. But it will take a few years for them to reach that, so I'm moving them out of my 10, into a 77, and then hopefully into a 150+.
However I think its important to make sure, as Soulfish was doing, that the people owning those fish, are aware of these adult size requirements, and are planning on purchasing the proper size aquarium, or have a plan to sell them to other hobbyists. To have a Colombian for example in a 10gal. and not realize its adult size, and as a result of not realizing that, are not planning on upgrading, just causes problems down the road for the owner, and the fish.