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Message: <blockquote data-quote="MBullock" data-source="post: 217306" data-attributes="member: 33994">mold in general is not very damaging to mygalomorphae, as they lack tracheae to breathe with. It's far more dangerous to true spiders though, as they utilize 'Bi-modal breathing' and use tracheae to breathe- inhaling and exhaling.  More active species like salticidae cannot handle stale air and rapidly decline in health and vigor when not given good airflow in their enclosures.</blockquote>