I do not use hides in my breeder rack except for the problem feeders. Our 41qt Adult tubs offer a lot of security and a nice dark area at the back of the tub, also hard to find and fit a hide for a big breeding size female. If you are not using a rack setup, I would stick to 2 identical hides, 1 on the hot and 1 on the cool side to ensure your BP has the security they need to be comfortable and thermoregulate as needed.
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