How big are your hatchlings size-wise (smallest, largest?)? I raised 30 together, then divided them up as they got bigger. I tried individual containers but I didn't like it because of the lack of swim space. I had 0 injuries. Doesn't mean yours will do the same - if they're similar in size and picking on each other then you may not have much choice. They could also be doing this because they're not being fed enough - I always left food in my containers, removing it and replacing with fresh stuff.
Alternatively, if you see who's doing the cannibalism, you could remove them and keep them individually, as I've read others have done successfully.
You could also spread them out more - say ten 1.5" axolotls per 12"x9" container? If you are interested in trying to split them into groups, I can give you more suggestions.
When I did use the solo container method, this is what I did: filled bucket, let water sit out for 24h, add dechlorinator. I had twice the number of containers than axolotls. I would take fresh containers, scoop water into them, set them on the table then pour the dirty water with axolotl in it through a net and into a larger container (I used this for group water changes, but still it works well). I then would take the net, flip it inside out and gently nudge the axolotl out of the net, without putting it in water. I did this because if food got caught in the net, it wouldn't join the axolotl in the clean water. Give a quick rub down of the now empty containers with fingers using dirty water, then dump the dirty water.