I was sold a couple of catfish a year or so ago, they were sold to me as some type of synodontis but I can't remember the name to save my life. It seems like it might have started with a k? Anyway, they are real dark with a tight looking giraffe pattern on the their body. They seem to love to graze on green algae, so don't be offended by the algae in my tank. I like it.
Here's a crappy pic maybe someone can post another pic for me to compare with?
Sorry for the large images. The first pic shows the pattern the best, the second pic shows the same fish and around the right side of the rock you can see the tail of the second of the two.
Thanks.

