Brown/shiny bronze spots..

Hi everyone. In the past few days I noticed increasing number of these spots on my plant, actually plants, nearly all have it now. It's around the bottom leaves, the top ones are fine (well I don't have that many, they're young lol). Also, they kinda suffer with curling up nearly since born — which I don't understand, since my temps are in check.


Sum up:

• From seeds
• Plants — 2 weeks old
• Grow medium — 1/3 potting compost, 1/3 Pelite, 1/3 Vermiculite
• No feed has been used
• I watch my tap water pH and bring it down, from it's normal 7.3-7.6 to 6.4 or 6.5 using previously lemon juice, now apple cider vinegar. I always leave the water sit well over 24 hours
• Check my water's ppms and its not too much, around 200 ppm
• I have a fan blowing at the plants
• Light 600W MH, distance 2 ft today, up till now had it nearly 3 ft.
• Started misting them 2 days ago when the lights go off to moisten the leaves, not much improvement, if anything at all

Issues:

• Possible Heat Stress
  
• Brown Spots

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Light stress and maybe a little mold from spraying them.

Cpappa27 said:

Light stress and maybe a little mold from spraying them.

Click to expand...

Thanks. But how can it be light stress when it was like 3 ft up til now. I mean even 3 ft is way above where it is recommended. What should I do.

Should I continue on misting them?

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Are the spots dry? My initial thought: P deficit, P getting locked out, or strain/plant(s) struggle(s) w/ P uptake.