I have 7 rescue cats that have been inside. They were all getting along until last week. Four had been spayed/neutered. I had to separate one female because she was in heat and hadn’t been spayed yet. There were also 2 males left to be neutered. They were fixed this past Saturday but 2-3 days before being neutered one of the males started to get aggressive with one female ( already spayed) in particular. Now that he has been neutered, he’s just as bad. The poor female trys to keep away and is scared of him. A couple of nights I’ve kept her by herself in another part of the house and then I let her back in with the others during the day because I can keep an eye on them. I don’t know if his behavior will calm down in a few weeks or not. Am I doing the wrong thing by separating her during the night? Help! Is there anything that I could do to stop him from being aggressive? Sometimes he gets aggressive with the others but not as bad as the one particular female.