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If you are including pitbulls, Parotocinclus jumbo, then you should add ottos. Pitbull are a bigger relative. A quick look at planetcatfish found several species of otos listed at 1.3" max.
If you're lucky, you can find an albino bristlenose "runt". 1" and no more. I have one and the only way I know he's in the tank is by examining the underside of leaf plants.
But appart from the plecos there are the ancistrus that they are in general smaller, correct? I think they do the same job practically and they have the same habbits..Does anyone know about?