Thanks for your response, @hottpeper13.
I did throw this kombucha batch out, but it would still be helpful to know what I did wrong in order to avoid such a state of scoby again. If anyone knows from the look of this scoby, please let me know.
Hi. Just now my big batch of kombucha has finished and I was about to pour it in bottles for the second fermentation when I noticed that the bottom of my scoby is very strange. I tried to search for pictures online to see whether it counts as moldy or not, but I did not find a clear answer...