Started a coopers Australian lager yesterday, pitched yeast at 24*c and gently folded into the foam, appears to be hardly any fermentation going on , zero bubbles coming through airlock , considering removing lid for a minute and giving a good stirring to introduce some air into it, is this a good idea or bad? Will it do it any harm? Please help, this is the third attempt at lager all been different ones, first was a great success and the second wasn't , although I don't know why, really want this one to excell.