I've grown in straw, it works,but the blackbirds do like to root around in it!! put a layer of grass clippings over the top. as light can get through the straw.
the liquid from a wormery is NOT worm pee!! they don't pee!! the reason that liquid runs out of a wormery is because the stuff going in the top has too much liquid in it, if this happens, add more shredded paper, and put the liquid back in! If you use the liquid as a food, dilute heavily.
rgds, tony ;)