Hello, this is my first post and sorry it's long. I have two guinea pigs both around the same age and sows. One is about five and the other is about four. I've had the older one for four years and I got the other more recently after the others cage mate passed. The bonding went well, they stayed in the neutral area for three days with no incidents and they were fine for about a week in there permanent cage but then they started fighting. I thought they just need to work things out so I added a cage extension to make sure they have plenty of space to assert dominance. However the fighting has not stopped and it usually only happens at night when the lights are off. They're in my bedroom so I know they are fighting. It seems to be more than asserting dominance or they can't figure out a dynamic. Another layer to this is that they are both having mite problems(I don't know the exact cause but I have theories) so I fear they might be grumpy and lashing out. They have both been to the vet a month ago and I gave them revolution but that didn't seem to work I've done other things. But I'm calling the vet about that tomorrow and I'm going to make a separate post so it's in the right spot.