...
The mold I've gotten here is like marshmallow fluff ... sticky and pure white and it stays mostly in the seed bed. Very odd stuff.
What you've described sounds like Aspergillus Mold. It generally appears as a thick white layer, like marshmallow fluff. (It can also be black or grey too). In general, I've seen it during my early trials (using seedling propagation trays that were manually watered) when the seed bed didn't drain quick enough and sat in water too long, or didn't get enough of a turnover of fresh water. What happens is that the grain seed, during germination produces enzymes and releases starches that, if not rinsed away during the flooding, becomes sticky glop build-up in the seed bed. Yeast in the air take hold, and fermentation begins, typically; however, in dirtier environments, the molds that give us pennecillin take hold and the gloppy starchy base becomes the fluff you described. Be sure your seed bed gets a supply of FRESH water to wash this build-up away, and be sure the trays drain as completely as possible. If recycling water, the starches will get recycled to coat the seeds again as well, more frequent reservoir water changes are necessary. Recycled water via reservoirs, even with filters, means more maintenance of the system, including system stops and flushes, to keep everything clean. During my phase 2 trials, using the actual flood and drain trays, for 9 trays and a 14 gallon reservoir, I had to change the water every morning, sometimes twice a day.
If you are washing, and pre-soaking your seeds in a pre-treatment, I would encourage you also to look towards your grow environment controls: are you growing this in the house, in a shared space in the kitchen? are there other foods or plants nearby? A floor with carpeting? Keep in mind that mold spores and yeast are present in the air and on foods already. Sprouting trays in an "open" environment will give you more mold and fruit fly problems than if the environment was enclosed either in a cabinet or a dedicated room.
This is why many turnkey fodder systems on the market place today are so expensive. They insist on not only selling the system, but the grow environment that contains it as well. They know very well that mold problems are very much a grow environment issue and not due to their system.