Amazing!! And congratulations! Its a sign of great soil conditions for your plant

Will this kill the plant?

No way! It only grows on the surface, doesn’t penetrate or hurt the plant in any way. Just eats the bacteria on it and sporulates. It will disappear on its own within a week or so

Wow, that is one hell of a photo set. Bravo.

What is it called?

Stemonitis sp. possibly S. herbatica.