I've had my yellow sea cucumber, Calvin, for about 2 months. This morning I noticed he has this...injury? I have no idea what could have caused it beside maybe a hermit crab? I do have a couple blue legs in the tank, but I've never seen anything go after him. To me it looks like it might be his intestines or some other internal organ that is pushing through a hole in his side. It's right by his head. He hasnt been extending to feed today, but I have seen him move a bit. I'm not sure if this is something he will heal from or not. I'd hate for him to die in the tank and nuke everything else in there. Has anyone seen anything like this before?