hey just need a little opinion and some help..im new to brewing apple cider..i recently started a brew of black rock cider, 1 kg of dextrose, and 2 litres of apple juice..my air lock hasnt bubbled once...i changed seals and checked for leaks but found none...but brew is foaming white and brown..is my brew ok or is it bugged..the water in air lock went up but not enough to kick it over to bubble..plzzz help