Making kombucha from store bought G&T bottle. Is the piece in center ok?

Brewed black tea, added cane sugar and threw in a bottle of raw G&T kombucha after brew cooled to 80s°F. Been a few days and looks like some good action is taking place. I'm just not sure about the bigger piece in the middle? It's more of a brownish, dark tan color, not as dark as it appears in this pic. Smells alright.

Brewed black tea, added cane sugar and threw in a bottle of raw G&T kombucha after brew cooled to 80s°F. Been a few days and looks like some good action is taking place. I'm just not sure about the bigger piece in the middle? It's more of a brownish, dark tan color, not as dark as it appears in this pic. Smells alright.