no substrate method question

[BChambers]

So if the boxes have to produce all their own humidity why would you want holes so that it leaches out? In a sealed box all that good humidity stays in the box.

As Chuck said, gas exchange. Since the substrate is saturated, there is no danger of losing a substantial amount of water over the 57-day incubation period, and the air exchange assures no buildup of CO2, especially late in incubation.

Brad Chambers