Advertisement So, I collected some wood for my milli (some kind of oak, I believe) and sterilized it- 200 degrees for around 45 minutes. Is any of this mold possibly toxic or unsafe for my milli? He's an O. ornatus for reference. (Sorry for the poor quality picture, my hands are super shaky.) There's gray fuzz, greenish stuff, white bumps to the right, and more gray stuff that looks like lint where i scraped off the bark (to give it to my milli) before.