I have a 46 gallon bowfront tank of neolamprologus multifasciatus that has been running for about 5 years. I started with 8 fish from 2 different sources, now there are at least 50 adults. I’ve noticed that several of my fish have what appears to be facial deformities or possibly old injuries that healed weird, though I’ve never seen a fish with a visible injury. These deformities are mostly in non-dominant males. Can this be caused by inbreeding? The fish pictured swim and eat fine, but one of them looks like he can’t close his mouth, another has a weird shaped face, and another has a crooked mouth.