I'm using sphagnum and have never had an issue with the humidity once its moistened but it's very humid here anyway. Mine is around 10-12 inches deep and they seem to stay about 2 inches up from the bottom with their main chamber. But they will tunnel all over it. One thing that I've noticed is that they only create 2 points of entry to the surface. Like a front door and back door so to speak. Mine live in deep all year round not just for nesting. They tunnel around all four sides and have chambers right up against the sides. Makes it fun to watch them. Sometimes they are visible sometimes they are net.

As you know they do produce their own scents (pheromones). I'm wondering if that plays a roll in how "comfortable" they are when it comes to egg depositing. How many days or weeks do you put them in your deep nesting box before the due date? I wonder if that time frame to acclimate to the new set up plays a roll in how soon they lay and how well they mound up the eggs.

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