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Message: <blockquote data-quote="MBullock" data-source="post: 196571" data-attributes="member: 33994">The use of cross-ventilation is to allow air into the lower levels of the enclosure-  cross ventilation is best added just above the substrate surface to ensure Co2 leaks out and doesnt pool.   Ventilation at the top will not work as well, as it lets air in, but the Co2 still pools, which can suffocate inverts that breathe via spiracles.</blockquote>