Fish looks crooked

[Mtaylor2004]

Can someone tell me what may be wrong with this fish? It's an mbuna cichlid, I'm not exactly sure what kind. Just recently out of nowhere his head looks crooked. I have a 55 gallon tank with a pleco, an upside down catfish, and 5 other mbunas. The crooked one still will come out to eat. He also can turn his head straight, but then it goes back crooked. There are a few pics attached of what he looks like. (BTW he doesn't live in the bowl, I moved him to get some pics.)

 

[Delapool]

Not so much for cichlids but old age or bad genetics are two common ones for me.

Internal bacterial or parasite infections are also possible but generally I find the fish shows other problems like bloating or not eating, etc.