The slime mold commonly found in tray grown wheat/barleygrass is non-toxic.It is a non-pathenogenic form of fungi,that can be a royal pain in the #^*$.Strict moisture control is the answer to growing mold free grass.I just stopped my growing of greens outside do to cold weather here in central Il,USA.I have pictures of my sprouts in the Image Gallery here at curezone.com in the photos section under grassmans sprouts.Where are you located at and do you have pictures of your sprouts?Good luck and happy sprouting!