I'm also in NC. I do use a damp towel (not wet) and cover a portion of the tank. I use a thick dish towel. Keeps the humidity at 50-55%. I cover more during shed to 70%. Her shed comes off in one long piece every time. The rust is an interesting point I had not thought of.

I keep an eye and uncover or cover more depending on where the humidity is at least during my on/off light change. My system is just working so well, I guess I'm just going to risk having to get a new top. Mine is a 20gl tank. I like how I can manage the humidity so particularly on a constant basis.


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