So friend gave me a SCOBY, and I brewed my sweet tea, cooled it, put it in a gallon jar with the SCOBY and a cup of starter, covered the jar with a cloth, and put it out of the way. The SCOBY wasn't floating on the top, but was down near the bottom, which I thought was ok. A few days later, I noticed a film on the top, which I took as a good sign that a new SCOBY was growing. The next time I checked, though, there were little clumps of what look like mold growing on the new SCOBY.
Should I remove the new SCOBY and see whether another one forms on top? Should I toss the new SCOBY and the Kombucha, and start again with the old SCOBY using different Kombucha as the starter, or is the old SCOBY contaminated, too? I'm new at this, and totally confused. Thanks for any thoughts you might have.