I ended up leaving them in the bonding area over night. They seemed ok taking a nap next to each other last night, and they ate dinner together as well. Right now, I’ve seen each of them go up to the other to interact, and i’ve seen no major aggressive behavior, just a bit of teeth chattering, raising their heads at each other, and some rumble strutting from them older of the two. The main thing that I was concerned about is my younger girls reaction to the older trying to mount her. She hasn’t snapped at the older, but she will start complaining pretty loudly, and will try running away from her. That’s been her reaction from her very first attempt last night, to this morning.
And yes, I read over the info in the link for bonding. It really helped me understand a lot of what was going on, so thank you!
I tried to set the area up properly before introducing them. The area they’re in at the moment has about twelve sq ft of space, two water bottle at opposite ends of the pen, I didn’t initially remove their bowls but I did after reading your reply, and scatter fed them instead, and an area for hay in the center of the cage. I let them sit in their with just that for the first hour or so while they were introducing themselves, and added a tunnel and a hide with three exits after they’d settled down a bit.