Fedding a sugar wash: Bacteria problems?

[Vulture]

Hello all,
I tried searching for this answer but after 3 hrs found only tidbits.
If there is a thread that deals with this problem.... point me to it and my apologies.

I am on 2nd run of a WSSW started at 1.06 got down to 1.01 in 2 days so I decided to push it.
Added some sugar (in solution) and now the color of the wash has gone from a dirty blond color to almost brown...plus some funky white (Cheto's) looking things are floating on top.
Smell isin't bad but not as good as first run.....

Wineo says I can cover it loosly so I'm not using air locks...
All will be strip run then treated with baking soda for 1 week then spirtit run.
Just going for neutral spirits till I get some experiance under my belt.

Questions
1.) How do I know if I have a Bacteria infection?
testing..not just looks and smell
2.) Can I fix it?
3.) should I through it out?
4.) what is the easiest way to prevent one in the future?

thanks for your time and point me to a thread if I missed it somewhere.
At your service and your families too!
Vul...