Thanks! I'm suspecting it is just some of the lees from the bottom that had an air bubble trapped inside that brought it too the top, I gave the carboy a slight shake , the bubble popped and it fell down with the rest of the sediment...I hope haha
Straight apple juice fermenting with lavlin yeast . About 3 weeks going. Noticed this weird looking blob on the top wondering if it's just residual yeast or something worse? I have looked on other threads at something called a yeast raft but couldn't find something that quite looks the same ...