HILLSTREAM LOACH images
Here is a rare shot of one of my Hillstream Loaches, Borneo Suckers, HK Pleco, whatever name you want to call them. I think their Latin name is "Beaufortia kweichowensis". They DO graze on algae and micro-organisms, although they are MUCH MORE playful if you feed them bloodworms and frozen brine shrimp. They have been eating off of the fat of the land only for over a month now and I see poop stringing out their little orifices, so there's enough naturally growing stuff in the tank to feed them without my input.
They have flat smooth bellies and prefer to sit on rocks in fast moving water, or on the glass.
http://www.lehigh.edu/~ded2/aquarium...h_On_Glass.jpg 
http://www.lehigh.edu/~ded2/aquarium...y_On_Glass.jpg