It looks like the tank has two plecos, not one. Those things seem to never stop growing even in small tanks. They would probably last longer than the aro, if the guy feeds them.
Guys seriously... this is Flucked!! there should be laws inplace that you have to prove you own such a size tank.... anyways... i know of a red tail catfish that is in a 125 and too big to even turn around... it's at a local petstore.. they had to take it in from someone who couldn't house it that bought it from them when it was little(law or something). i know the chick was talking about them setting up one of the ponds in the store but idk if it's happened. if anyone can home it i have the name of the pet store. it's in Massachusetts.