I think the problem was with the way I drained the scoop. Because flies, gnats, and even wasps drown in 5g bucket all the time, no problem. But the small scoop strainer I had only holds about 1/2cup of feed, and I let it drain about 5 minutes before feeding. It takes 2 scoops to feed the kids. Their really is very little water draining out of it, just enough for flies and gnats to drowned in. I think that's why I the bad mold was able to get a start in the drain bucket. Just nit enough good bacteria to fight of the invasive junk. And the main reasons that I decided it was bad was the fact that a) the chicks quit eating it, for no obvious teason. And b) I actually like the smell of the FF feed, so when this other stuff induced involuntary gag reflex. Something wasn't right. It doesn't even smeel like fermentation now. It's just foul. Anyway, I have a new batch been cooking since last night, and wilk start them on it tonight. And I'm being more careful with where I let the stuff drain. I don't expect any further problems.
Not quite sure what happens to mine but it does get smelling bad enough to make me want to hurl. I put nylon stocking over the top to keep the flies and gnats out, too. It's just that after a month or so, it starts to go "off." Must be a wild bug I have floating around here or something. The white fungus stuff doesn't bother me at all but that odor. Wow. Worse than an old rat carcass.