I cut holes in the lid and taped coffee filters over them so that air could get in without letting any little critters in. I might have to rethink that.Yes , that’s a good idea . Vent your lid by covering a two inch square hole with fine cotton cloth if you haven’t already . You can go beyond that by storing your culture in a pillow case too . Mites are something else , they get in everywhere if you don’t watch it .