His head is only slightly deformed, this deformity or injury occurs in the spine. Actually appears that maybe the occipital condyl is curved downward, and the atlas continues this curvature. IMO anyway. lol. I've noticed that in catfish that have deformities they tend to get worse as they grow and their bones get longer the deformities become exaggerated. Good luck with this guy. I say give him a nice home, a lesser person would do away with it. I've been told that I shouldn't keep my tsn with his curved skull because it lessens the quality of fish in the hobby. I like him just fine though. Lots of personality.