I agree, the albinos are so pretty! I saw a beautiful common pleco that was a gorgeous yellow color... and it seems to me that it would be easier to tell if there is an issue with them (i.e sores, parasites, etc) because of the lighter body... and it sounds like your 4" doesnt clean the glass because your a good owner and feed him well. He doesnt feel the need to clean the glass and decor just to eat! lol