I was in a restaurant supply store and i saw these stainless steel drains that would be perfect for ventilation. In my thinking a large hole could be drilled into the glass and then they could be siliconed in. Then I saw mention of Tarantulas ability to "chew" through aluminum wire screen. Is there anything that would stop them from "chewing" through the silicone seal, pushing up the steel drain and then escaping through the large hole?