How can i keep mold out of my crabitat but keep the humidity up?

I discovered mold growing on some driftwood i have in my crabitat. I’ve cleaned the mold up but im afraid it’s going to come back. I’m guessing the reason why mold is growing is because my humidity is too high and not enough airflow. I have sponges in each of my water bowls and crushed coral substrate. How can i keep the humidity high but not too high, and have enough airflow through the tank without growing mold?

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