There is absolutely nothing wrong with your SCOBY if it sinks to the bottom of your brewing vessel. SCOBYs have a mind of their own and will often do funny things during the brewing process. ... The fact is, your SCOBY will likely rise to the top after 4-5 days. Even if it doesn't, that's okay too!

Should SCOBY be completely submerged?

Add the SCOBYs - make sure the SCOBYs are fully submerged in the tea! Cover with a tight weave breathable cloth and secure with a rubber band. That's it!

Should a kombucha SCOBY sink or float?

The short answer is no! Fortunately, a sinking mother SCOBY is not at all something to worry about. ... For now, you should know that your mother SCOBY can sink, float at the top, float sideways in the middle—it doesn't matter what position they are in. In fact, they will likely move throughout the brew!