Hi all. I came home yesterday morning and found fur and possibly pee on the floor. I have 8 cats and everyone is fixed and 2 are aggressors and 1.5 are the victims. The aggressors: Mochi and Bear are bottle baby siblings currently 4yo and Bobo is a foster fail currently 2yo. There was never any issues between these 3 before. Mochi and Bear would usually go after Luna (6yo) to the point Luna had her own room but she now is moving around the house. I recently lost my oldest Sunny (12yo) and I believe that’s what set off Mochi. They weren’t friends but maybe the loss changed the dynamics? Mochi doesn’t like other cats and refuses to eat with everyone. I’ll admit Mochi and Bear are spoiled lol. I’m considering the best way to deal with this. Bobo has started peeing in my mom’s plants and peeing on the floor in fear and territory. I can’t use sprays or defusers because I have birds (bad for their lungs). I’m thinking of calming collars for the 3 of them and possibly a reintroduction. Any thoughts? I’m desperate. Thank you.