Ooh, awesome, someone who knows! I couldn't find anything conclusive in my wanderings as to whether there were more than one kind of these guys, even though there appeared to be. I knew he was different than some cuz he had that dip in his dorsal fin that almost looked like a bite out of it.
He's definitely a Baryancistrus demantoides :D My LFS got both kinds in the shipment, and both myself and the LFS guy (who I love) could tell they were two different kinds, but didn't know enough to separately ID them. I went for this kind cuz I like the way the fins fade out to yellow.
Here's a newer photo. He's claimed this hole in a rock as "his spot" and he's there 99% of the day. Sometimes he moves to the cave next door, but only for a couple of minutes. Not the most interactive fish I've owned, but I sure do love him!!