Giant Puffer in Aquarium City

If any of you have been to Aquarium City in Canoga Park CA, have you ever seen that giant (I meant giant...) fw puffer in one of their low-tech tanks?

While browsing through the plants and inspecting them REALLL close to my eyes, I got startled by a giant freshwater puffer making his way through the tank. I am not kidding about it being giant. The thing was bigger than both of my fists put together, with eyes the size of a dime. Yet somehow... I didn't see it earlier because it was hiding. Poor thing though... it was at least 8 inches long, and stuffed in a 20 gallon with plants everywhere. It looked miserable. There was algae growing on the poor fellow... Anywho, I was wondering what kind of puffer it is and if the thing is just bigger than normal...

Here's what it looked like:
http://www.aquariumfish.net/images_01/puffer_brazilian_w360.jpg

Just imagine this guy in the picture, multiply him by 5, and imagine green algae on him.