Trying to help out the LFS. These things act like Dino's.. disperse when lights out regroup with lights on. Strands with encased gas bubbles if they sit long enough. I pulled some out with a turkey baster into a baggie and the water was brownish.. it cleared up in an hour or so and this stuff clumped together. I am however uncertain because of the shape under the scope (photos below) at 40x 100x and 400x. I have video too. They seem quite mobile and swim around freely. Seems to like the sand but in the tank shot can see it's starting to go up the side of the acrylic.