With the last round of chicks I had, we used two cardboard boxes. One that was smaller for when they were small, and then another that was a little bit bigger. This year, I want to keep them in the brooder for a little longer, so I was thinking of making a brooder bigger by connecting cardboard boxes as they needed more space. I have read that you have to change the cardboard boxes every few days for sanitary reasons, so that would ruin my entire plan. What are your experiences?