Plant with white stuff on leaf (pictures)

[Sonbogo]

Hey hey!
Im up for my first grow and are growing autos under 200w cfl (going to upgrade soon) and plants are about 2 weeks and have in some days showed signs of trouble.
Im realized ive been underwatering a bit and maybe dropping the ph too low at 6-6.5. but that thinks ive just fixed that. I use light soil and have not fed yet



its difficult to see but its placed on the lowest leave on the picture, and with daylight on it is white, and kinda looks like powder, but hard to tell really.
Anyone having an idea about what my plants is telling me????

 

[burgertime2010]

Hey hey! Im up for my first grow and are growing autos under 200w cfl (going to upgrade soon) and plants are about 2 weeks and have in some days showed signs of trouble. Im realized ive been underwatering a bit and maybe dropping the ph too low at 6-6.5. but that thinks ive just fixed that. I use light soil and have not fed yet View attachment 2753156View attachment 2753157 its difficult to see but its placed on the lowest leave on the picture, and with daylight on it is white, and kinda looks like powder, but hard to tell really. Anyone having an idea about what my plants is telling me????

It is time to start very light feeding, your babies might be a bit hot. Cal-mag and neem spray in the dark may help.

 

[Dankfactory]

Simply some calcium residue from a dried droplet of water. Dont worry about it.
If you're using hard water tap I wouldn't add any cal mag, as your tap is already chock full. Soft water tap or RO, and you'll need some cal mag.

 

[Sonbogo]

i use tap water so nothing to worry about. i just fed 2 teaspoons in 1 litre of water and poured it (i watered earlier today with no fertilizer)
i bet thats fine, thanks for help!