newb, brand new young tasty and tender flytrap flesh is prime eats for fungus gnat larvae.

Submerging in water above the crown will probably do the trick, though, I should think a few hours at most would be sufficient.

Also, you can spray the soil with a light misting of neem oil, that should kill the little buggers.

Someone like Tony who keeps hundreds if not thousands of plants can probably tell you the most effective spot treatment for one plant.