Figured I'd put this here, it's a testament to how tough these guys are. Mine is about 10-12 inches in a 120. And his face is broken. Happened 3 years ago, the bugger lived. His whiskers cross over his head, so he turns the wrong way for food sometimes. He gets on fine now though. I thought for sure he'd die. He eats massivore like the ck.
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I've been keeping LSN for a decade now and only recently I started experiencing the same problem. I keep them in 240 gal tanks, 18 in one and 2 in the other. Out of these 20 LSN I keep right now, perhaps 1/3 has a damaged snout, not to the extent that yours does (which I have seen before on other specimen) but to a varying extent, from a slight angle to a 45 degree.
I've not figured out why current ones are spookier than the prior fish. Every tank and every stock differs of course and I am sure it's something in there that matters. Being in with a boisterous, large, and aggressively-feeding tigrinus catfish seems to be one source of stress to them I noted... and I've never had such a combination before.