Sorry I am not up to your higher ranks of breeding rats yet. I thank all those whom have had some insightful responses and I hope that I don't breed to many rats to have them chew out of my cheap tubs. I have 20 breeding females now and think I should be good for awhile. Do you guys who are still at my level use a 2x2 in between the racks for supporting the screen underneath? I am still wondering what the crossbar is that I always see in the pictures of the racks.









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