Most likely, cellulosic film. The kombucha works out if you physically take out the zoogleal mat (mother) from the jar, decant, and use a small tiny bit of the bottom flocculating yeast in a new wash, then add it into a standard 3% brine or established wash. But all the acetobacter variants (glucono, aceto, gluconoaceto...) don't work all that well. The yeasts aren't too bad when used sparingly.
To fix this, I would scrape it all down, salt rub, then start over.