Grey spots! Fungus or Mold or Deficiencies?

Bought a small vegging Train Wreck (first 2 small pics) in soil. Gave it its own T5 and gave it plain reversed osmosis water. Soon noticed it was getting covered in grey spots. I thought I was sold a bad plant but then I took a look at my flowering plants (last big pic) (in the room over) and noticed they had similar spots, although not nearly as obvious rampant. The stuff appears as grey spots usually close to the edges of the leaf. The leaf starts to yellow around the grey . The flowering room has 1000w lights at 75% and gets water 4 times a day on hydro. The temp varies from about 74F (house temp with lights off) to about 82F (12 hours of lights on). The humidity in the rooms is always between 45-50%. I've noticed some flies buzzing around if that affects anything.

Need better pics.

Wet

That drooping is over watering I would think~
With excess water you could have mold~
The one leave tip looks burnt~

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Here's some more pics. This is the train wreck plant i got. Still young and I've just been giving it plain reverse osmosis water so the pH and nutes wont be calibrated. If these dark grey spots are a deficiency it'd make sense. I sprayed some fungicide two days prior to these pics and can see the leaves i cut off due to having grey spots (that werent there two days ago ... a lot!).

looks like you have a phosphorous deficiency there bro...