I saw someone nearby was getting rid of their FN 182, and I've been waiting to upsize the cage for my babies, so I'd really like to get it. I'm having a little difficulty with the cage calculator, but I was wondering if anyone knew how many rats it would be best to keep in a FN 182 after splitting it into two separate units? As in splitting off the first and second level to make it two different cages. I assumed probably about three or so per level, but I'd really appreciate it if anyone knew better. Thanks a lot!