Hmmmm, something must be wrong with my "subscription" feature -- sorry for the late reply but I didn't realize there were new posts in this thread. Guess I better just get my act together and log in here at least once a day.
Habitat and sibling attacks: Yes, they are in individual breeder nets. When I first brought them home and was acclimating them to my tank water in one large container they were already having altercations and run-ins so I immediately set up separate housing. A few days later I found one hatchling dead in the breeder net of another hatchling. He apparently moved from one net to the other and got killed by his sibling. :(
The original owner had all the hatchlings in one big tank and had just started to notice fighting the weekend I picked them up so it seems like "3 weeks of age" is when the fighting began.
Individual personalities: I can definitely already see different characteristics.
One (the largest one) is very food motivated and takes little or no interest in me but does come quickly out of his shell (literally) to check out what I am bringing to eat. Unfortunately he is very picky about what he'll eat, but he likes to thoroughly check everything out before rudely throwing it back at me.
The second one (the smallest) is not very interactive, not even when I'm delivering food. He peeks out of his shell when he sees me making a food delivery but quickly ducks back in if I get too close. He'll grab whatever I'm offering, run into his shell with it, and then usually toss it out after a minute but only using the tips of his tentacles.... he keeps his mantle hidden while I'm there.
The third one is rapidly becoming my favorite. She/he is in the middle (size wise) but is the most interactive with me. She does not seem very interested in food at all, but she is curious about me. Because of this she's the one I've worked with the most regarding trying to interact, bond with, and touch. The other night we made great progress. She was well out of her shell and sitting on the interior outer edge frame of the net. I slowly put my finger within a few inches and she didn't leave. I kept putting it in and taking it out, hoping she'd realize I wasn't a threat. After several minutes of this I would put it right up next to her and she would "tap" me with one tentacle. Thinking that might mean "get away" I would retreat and try again a minute later. Soon I was able to leave my finger next to her, touching her. After about 20 minutes of this she actually started walking over my finger to get to the other side, and then would walk back over the other way. At one point, she "rested" on my finger and brought tears to my eyes. I think that was great progress and will do this again whenever she seems receptive.
Inking: I saw my very first inking last night! It was from #3 (the sociable one) and I think I startled her with the feeding syringe or caught her off guard or something. All of a sudden there was a puff of black and she ran back to her shell. I was sad that I scared her but so excited to see my first inking!
I will try for more videos but it's so hard while they are in those breeding nets.