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Here is link to my two small males fighting. They had not yet started mating with the female but displayed to each other (and left a few hickeys) frequently. Oddly, the largest male, Jabba did not participate in this behavior, was the gentlest of them all and lived the longest.
Right now I'm thinking I may have 2 males (Rorschach and Laz) and 2 females, (Nib and Blot) but it's hard to be sure. They really only do the displaying at this point when squabbling over hiding spots in the rock work. I've definitely seen the 2 bigger cuttles do the display. They don't seem to end in aggression though, they tend to display and then just one of them will leave the spot they're fighting for. There's one particular little cave they seem to really like.
Hey! Yes! I have a bunch, just haven't gotten around to putting them on YouTube. If you're on Twitter I did post a bunch of them there as @BlackMudpuppy. I will update my thread soon. I think I have mostly males as Ive been seeing a ton of displaying at each other. Also, I tried offering them some small crabs last night, but they weren't interested yet.