Well, it's going to take some time to get used to the surroundings, and they will hide if they are too cramped from my experience- and then they start killing each other off. I have to move some out of my 40 breeder because they are too cramped.
IF they are berried, they will hide for the entire berried period from what I have observed.
IF they are berried, they will hide for the entire berried period from what I have observed.