Pictus get 9" long and uproot stuff dood, what were you smokin' before you posted?
You could also do C. perugiae, a neat little catfish that internally fertilizes and the females lay viable eggs that they care for. Another one would be Ancistrus claro that gets just over 2" SL. Aspidoras are another neat, small, cory type cat that likes to be in shoals. Hara hara or Hara jordani are very neat tiny little cats that are really fun to watch for the few seconds them come out to swim around to eat . For pictures of any of these, you can find more catfish info than you could ever want at http://www.planetcatfish.com .