I've just finished a 60 minute boil and realized my only airstopper is already occupied in a secondary fermenter. Today's brew is going in my 5 gallon pail to ferment. Should I cover the little hole where the airstop usually goes or just leave it open? I'm thinking leave it open since isn't this similar to the way people ferment with blow-off tubes - just leave the top of the jug open? I'm thinking if I try to cap it the CO2 will just pop it open anyway if fermentation starts. I can pick up another airstop tomorrow.