What did I screw up with my Corn Mash???

[BMAC]

I attempted to make my first corn mash this past Friday. I put 5lbs of cracked corn into a 5 gallon pail. Filled the bucket 3/4 full of water, which had about 4 inches above the corn.

Then I added about 10 drops of beano to the mix and put my yeast into the bucket. The next day I stirred the concoction and noticed it was starting to ferment.

Everything seemed to be going well. So I figured I would add 5 more drops of beano just to make sure the enzyme conversion was happening. Then I let it sit for another 24 hours. I stirred again and the fermentation seemed to be crashing. The whole thing has gone down hill since and this morning when I checked the mash it has this nasty looking white scum on top. Maybe some kind of a bacterial infection????

What did I screw up? There is zero smell of alcohol in it.