Random chinchilla aggression

[Olly]

I've had two male chinchillas together for almost two months now. Most days they're great together. They snuggle up together during the day and they get plenty of playtime outside the cage when I get home from work. But once in a while, my newer chin aspen, will become aggressive towards my first chin, olly. On those nights, aspen will chase olly around the cage. I can tell olly is stressed, and sometimes he will start barking. Should I separate them for good? Or is it something I can fix. Like I said, 95% of the time they are best buds. Then on those random nights it changes. I'm at loss. Help?

 

[BooBoo*TheKiddo*]

When I first got Shiloh and Gizmo they were best buddies. Gizmo loved attention and Shiloh never bothered with me, but I tried anyways. After awhile they started doing the same thing. Gizmo would chase Shiloh and after very short bit Shiloh would bark at him.
Like you said, it wasn't a nightly thing and they got along great most of the time, so I decided to leave them together. Shiloh became even more withdrawn than before. Often he never left his wooden house. I got to watching them closer and it had become a nightly thing, Gizmo was even stopping Shiloh from eating at the same time as him.
Out of fear of blood shed, I choose to separate. I felt bad for a bit because they both seems so lonely, but Shiloh blossomed. Turns out, away from Gizmo, he is the sweetest little guy. Not much for being held, but loves pets and scratches. To this day, they both live alone.
I tried repairing both of them but Gizmo was to aggressive. Shiloh found himself a playtime buddy with Tucker, but got defensive and territorial once in a cage. So they were caged side by side and played together outside their cages.

I'm not saying the same thing will happen to your boys, just wanted to share my experience with it. If you end up having to separate maybe they'll be playtime buddies, but not cage mates.

 

[Stackie]

Definitely separate now before things get worse. You are lucky you have a warning sign. I had two chins that were together for over a year, best buds, cuddled all the time. One morning I woke up to find one of the chins bloody at the bottom of the cage. Despite an emergency vet visit, he didn't make it. When chins fight it is brutal. Chasing and a stressed chin is a big red flag.