I apologize if this is the wrong spot to place this, but I have four male rats, my oldest who is 2yrs and 5mths, his brother has unfortunately passed just last month, and I have two that are around a year maybe a little older give or take. I had introduced the oldest boys with the two younger and they did amazing for intros. However I have gotten a male rat who's been alone most of his life who is around two years. They have been living in a dcn, my three up top and Zeus, the new one, below. They've met a few times and last night I had began intros. It went like a dream, so this morning I placed them into my next cage up. They stayed there all day and again, a literal dream so I decided to completely clean the cage and placed them in with it all set up and both floors. They seem to be doing ok but I just don't know if it's too good to be true for it to go this well? Any thoughts?