I've had 2 chinchillas for a while that got along perfectly shortly after settling their differences upon introduction. A few days ago I received two more chins that were not bonded to each other, but were cage neighbors and the previous owner never tried introducing them except the night before I got them. From my last introduction I figured that taking them all out together was the easiest way for them to meet, although I expected lots of flying fur and pee. They were put in the bathroom, and one chinchilla (a new one) quickly found a corner above the tub and stayed there, only interacting with the others to show his teeth if they came too close. We put them all in the same cage when they calmed down, and that night had to remove my older two as the newer ones had calmed down to each other but my first ones hadn't accepted their new brothers yet. Now the four are all in the same cage just fine, but the chin who took the bathtub corner (wow I should have used names lol this is getting confusing) quickly claimed the house in the cage. For a while he wouldn't allow any of the others to go near the door, but now he for the most part allows the others to be in the house with him but he is still short tempered and I hear him make noises somewhat often. But he doesn't leave the house at all! I don't want to remove the house because I don't want him to get scared and have nowhere to hide but I'm worried because I don't know if he is eating or drinking. What should I do so he leaves his house and interacts with the others instead of hiding his days away?