OK, in the next few days I will be doing my FIRST yeast starter. Like a kid at Christmas I am quite excited taking yet one more step that should help my beer brewing.
I know how to make the starter, I will be letting it go about 2 days in my NEW 2000 mL flask on top of my home made stir plate, will cover it with tin foil sprayed with san star etc.
Anyway - here is my question though. When I go to cold crash it in the fridge (if I understand it right - for about 12 -24 hours then decant) is it ok to leave the tin foil on top? Or do I at that time need to replace that with an air lock? not for blow off but more for sanitation? Should I be worried about just leaving the tin foil on, maybe rubber banded?
I just don’t want to get bacteria etc but maybe it is not an issue.