Small brown spots on first leaves

SpaceLulu

New Member
Hello everyone. I am not sure if this is a problem or what is going on but it is safer to ask.
I have 3 plants and only one is having this problem.



There are some brown spots (seen on the left leaf on the picture) that appeared only on those first 2 leafs that appear on the plant.
Plants are under 250W MH, about 8inch under it, I always check with my hand if its too hot and its not.
Lights are on 18/6 cycle.
Temperature is around 68 - 77F
I am watering it only with distilled water, haven't fed them yet (could this be a problem)
Humidity is around 45-60 RH
Plants are about 14 days old (from being put to germanize)

Is this a problem? should I be worried?
 
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