Good evening, I dont believe my guinea pigs are getting along, we have a 120cm cage and 2 or more of everything for 2 guinea pigs but 1 will constantly grunt and chase the other one and it has been 3 weeks and they are sisters born together. My children are so upset and I don't know what to do. We get them put for exercise everyday using a wooly hat to move them as to get used to us and they get more than enough veg etc. The one being chased also has bits missing out of her ear. I am at a loss and am fearing that they won't get along and need to make the sacrifice of rehousing the aggressor and having a single guinea pig as she is much happier without the other one around. Please help?