I have two female guinea pigs (Mazy and JoJo) that are 3 years old. They have been together since they were babies, and are very spoiled. I want to get a male guinea pig from the shelter who is about 2 years old. He is very mellow and sweet. Would it be a good idea to introduce him to JoJo and Mazy? I've heard some people say you should have at least 3 females before getting a male, but I've also heard the opposite. The only thing I'm worried about is the male guinea pig fighting with JoJo and Mazy. About three years ago they got into a huge fight due to stress and had to be separated for about a month. I just don't want them to start fighting again because of the stress of a new guinea pig.