Mold signifies contamination, which, while rare, can be serious. If your SCOBY shows signs of mold, discard the SCOBY and the Kombucha. Ensure thorough cleaning and sanitization of all equipment before initiating a new batch. Always start anew with a pristine, uncontaminated SCOBY. If in doubt, send us a message with a photo, and we'll assist you in troubleshooting and identifying the issue.