m0useanswered grow question 3 years ago You sure that's from the tank? It looks like a load, don't know about carbo though.
for real though,
are their any foul odours coming out of the tank?
Might have been just dislodged rescently and unrelated to carboload?
https://www.thcfarmer.com/threads/brown-jelly.37463/
All just guesses.
Hopefully one of the hydro heads chime in and help yea out.
Good Luck!