In an attempt to make a cheap giifts, I inoculated 10 small poly tube bags containing un-supplemented sawdust (about 2lb per bag) with elm oyster spawn I had. I made a slit in the top and covered with milipore tape, as I had no small patch bags. Its day 10 and growth has been ok, no signs of contam, but I'm worried I'm getting what looks overlay (coating over patches which cracks on bending) (I read that thin poly was permeable?). I think I should poke growth slits now and move to FC, since I want to gift them soon anyway. But looking for advice. This was an experiment so I'm open to suggestions on how to do better next time, or for the benefit of others. Note the darker spots iin bags are seeds from the spawn.