I've been doing a series of tests on marine snow, debris, detritus and have to agree on what scientists say about it's part in the natural dinoflagellate blooms.
Even though I've seen dinos sitting on bare rocks the most common places they settle in is where there is organic debris. So this adds to the other parameters we have discussed frequently.
Here is an awesome photo that shows what dinos are doing when they are free swimming.
This has to be the same stuff that binds the dinos in mats.
https://youtu.be/4WB-NNS84Eg?t=2963