Any Idea What This Is ? fungus or disease?

[Bigdaddy216]

Say Can Anyone Identify What's Going on Here?
Well Last Nite My Baby Nephew Yanked My Darn plant
Out My DWC System (Wanted to Kill him) But As I
Discovered The Grow Plug Had Ton Of White Crust On
It Also Stem Had White bumps and Leaves Was Dying
around edges....

Info

That's About 1 month old Cucumber plant
DWC, under 150w of cfl one warm & one daylight
nutrient change every two weeks
Fan 24/7 - water pump 24/7 - 1 medium air stone
lights on 7am till 9pm