Hello! I have two Guinea pig sisters who were born completely healthy, and that I later adopted. Their names are Alfie and Cleo. When I first got them they seemed to easily get along, as well as with my mother figure (not biological) pig, Juliet. I hadn’t noticed any kind of unfriendly aggression, and wasn’t expecting it since they had also got along fine before they came to me. Then one night I walked in on them full out fighting with each other. It was one big blur of Guinea pig. I grabbed them and noticed Cleo had been bitten and was bleeding by her nose, and both pigs had lost quite a bit of hair in the fight. After their mother figure pig, Juliet sadly passed away, I upgraded their cages but kept them separated. I expected them to eventually make up and was still shocked they fought in the first place, since they are both females and biological sisters (vet confirmed). But every time I bring them out for a playtime they continue to fight and I have to separate them. I partially combined their cages so that they are right next to each other, and removed the coroplast (plastic) so all that separates them on two floors of their cage is 1 thin C&C divider. They can sniff each other, and definitely see each other, but can back away if anyone tries to bite. I will continue to bring them out to see each other, even if it doesn’t last long before someone gets mad, and I will hope for the day they might end up getting along and I can combined their cages to make a palace lol. Does anyone have any advice or something I should be doing with them? It would absolutely crush me to have to give them away especially since individually I’ve gotten really close with them, I love them to death. But I still feel bad they don’t have someone to snuggle up with and happily play with. I cannot afford any more pigs and truly don’t have the space. Any advice helps and happy holidays!