I harvested some 2633 this morning and saw this when I checked on it settling. There was some white spots in the bottom of the fermenter as well. The beer tastes great, but what the heck is it? ???
Could be Hot/cold break all clumped up. Could also be clumps of floccating yeast
Did you use pellet hops? Could just be clumps of the pellets.
I can’t imagine mold beginning on the container that quickly. Probably trub or hops…but I would watch to see if it spreads.