For what it's worth, this happened to one of my bathes using Sparkolloid as well. Followed the directions exactly, well...I poured it in still hot n warm. On two other batches I used sparkolloid after letting it cool to jelliness. Those batches cleared without issue, or noticeable jellyfish. But this batch...the jelly fish moves about an inch downward per day, the mead above is clear, the mead below is not. Its super noticeable in a dark room when you flashlight the carboy.