I believe that the rubbernose gets somewhere in the 7-8 inch range at tops,
my lfs got them in, but only had 4 of them in the shipment, usually they get them larger, in the 3-4 inch range. Little George cost me $7, which I had wondered if I should have got him since he has hid for the last month, but now he is right out in the open and seems to not be people or camera shy at all! He must have decided that they 2 little girls running around all day long are not gunna stop, so he might as well go nibble on that tasty looking algae at the top of the driftwood. It is a good place for him, he is about 4 inches from the top of the tank and right under the CF light, the algae grows back in about 2 days after he clears off a spot... kinda like cattle in a pasture.. theres always new greens to eat.
EDIT: He has also decided to hide in the mass of Java Moss that is right below him when he gets spooked, you can see just a few shoots of it growing up in the picture just below him. Maybe I can get a pic of him in there!