There is some specie of Pleco at the Detroit Aquirium- Belle Isle Aquarium I believe it is called, that is over 2ft long. I was trying to ID it, but it was so far back that I couldn't really see any noticible marks, other then it was definately a pleco, Next time I go there, I'm going to ask the keepers how old it is. It was gorgeous..well as gorgeous as I could tell from behind the large tree brances it was hiding behind.
Matt