hey guys....this is my 1st hatch in a LONG time (22 years ago). and i'm wondering about the red plastic plug that is on top of the hova-bators. i've had mine plugged. and to my understanding (please correct me if i'm wrong)....u plug it up till day 18? then you take the plug out so more oxygen can get in the bator during lockdown? i'm not 100% sure on this, that's why i'm asking.
