Spells to help my cats get along

Hi, I am looking to see if anyone knows some type of spell work to help my cats like each other. My older cat (Kitty) is a 9yrs old tuxedo cat, she has been my cat since I was 11. Though she lives with my parents her and I have a very special bond unlike her bond with any of my other siblings or my parents. I decided to get my own cat to bring to college with me. I decided this because Kitty is an indoor/outdoor cat. She has a group of cats in the neighborhood that she is friends with. During spring and summer she tends to hunt and kill bunnies and birds. The reason I didn’t want to bring Kitty with me was because she would have been very unhappy being unable to not go outside, be in a smaller apartment without a yard, missing my other family members, and missing my dogs (who she is close with). In April I decided to adopt a 2yrs old white and grey tabby girl named Chia. She in an indoor cat and the most sweet cuddly girl I’ve ever met. She is very needy but also silly. I hoped they would get along before I go to school. Chia is in a room by herself while Kitty gets the whole house besides that room. I wish they got along so I didn’t have to split my time between them and feel like I am choosing one over the other when I spend time with the other. They can see each other through a gate and have been aggressive towards each other. Each have instigated the aggression. Is there any type of spell work or magick that would help them be less aggressive and able to coexist?