It's a Synodontis decora or decora-look-alike. True decora should have all 6 barbels branched (that is including its maxillary barbes - they have much smaller but quite discernable branches) and have an extension on its dorsal and most usually stripes on the dorsal and the caudal. Check this out please http://www.planetcatfish.com/common/species.php?species_id=84