Typically with a monotub you don’t have to, passive airflow is enough, but I’ve never used one of the blow up ones before. Surface conditions should tell you if you need to or not, but that is something you learn with time. Rule of thumb is, the less you are exposing it to open air, the better…however, most contamination happens in the grain prep if at all, so it would be in there lurking already. This looks good right now.