I can't find the link for this so I'm asking maybe some one can give it. I've always done it in my tub or a play pin. But I have a potential adopter who has never done one and asked if I could email her info before she adopts one of my rescues. A little info she has 1 1/2 old female that did have a cage mate in tell 6 mo ago when the room mate moved out. She want to get a new girl but wants to do what's best for the one she has now. She asked about a baby and I did let her know that I also have a momma that was a rescue that's up for adoption as well. She asked what would be better for her current rat and the best way to re introduce her to a new rat. She don't have a tub.