is introducing new rattys to an established group of older ladies a good idea? i have 3 girls: sasha (who will be 3 in the middle of october), eddie and patsy (unsure of there exact age but there around 3/4 months younger than sasha). sasha and patsy are fairly chilled out but eddie can be somewhat highly strung
im a bit worried about what to do when the inevitable happens, ie my girls are getting closer to the rainbow bridge

i dont want one of them to be alone, but i dont want to stress them by introducing new rats, especially when they've been living together for 2 years with no attempted intros since eddie and patsy where introduced to sasha at first.
all advice greatly appreciated

proud mum to the three amigos: sasha, eddie and patsy. and in memory of maybelle: you may be gone but your chew marks on my bed still remain. rip little one
i may not be a rat expert, but please feel free to PM me for ferret advice!