I racked my cider to secondary today and found 3 fruit flies floating at the bottom of my airlock.
I’ve cracked the S-style air locks by grabbing them too high to twist from the bung. Now I only use two fingers and grip the air lock on the stem just above the bung using very light twisting pressure. I have several spares also.
Wiggle wiggle. Don’t think the fruit flies will make it but no big deal if they do they won’t drink much
I hope you flushed that headspace with CO2 or you’ll likely have vinegar…
On that type off stopper, you can slip a 1/2" ID tubing over that nipple and put the other end in a growler half full of water… Since I started doing that, I no longer use those plastic air lockers… Sneezles61