Glad to hear things are moving along. Any time one of my ratties got hand/foot injuries with bites, it was from interaction through the bars. They seem to be much meaner or more territorial when interacting through the bars, instead of face-to-face. I learned not to allow any contact unless they are already living together. I had to block off the upper and lower levels of the CN with a thin board to prevent bites. And don't get discouraged - it took weeks to integrate my two groups. Don't put a time limit on intros - some are quick, and some are looooooong...