Help identifying problem and solution

[ajr1030]

Hey all. I know it’s hard to tell but In the photo I posted, particularly at the top most leaf, I have a discolorization issue that I don’t know how to identify with my Jack Herer Autos. I’m a rookie so, lol. Almost whitish hue to it. Any info as always is appreciated.

My setup

-600w LED at about 22-24 inches above canopy in a 4x4 tent
-they’re about 14 days from the first sprout in soil.
-have watered as needed. To be perfectly honest I do not know if when I’m watering I’m giving enough or too much. There is run off. I’ve dumped the run off off twice if it sat there for a day or two. Don’t know if that’s a good move or not.
-I’ve given two feedings of fox farm trio at half strength and cal mag. I’ve been told that I should feed by now. Then another tells me that I shouldn’t feed at all til week 3 so I’m not sure what to do.
-ummm 18 on 6 off light cycle.
-temps have varied at times by a matter of 20+F some days but otherwise fairly steady. Same goes for humidity....
-think that’s all I can think of. Again any info is truly helpful.

 

[Nunyabiz]

That looks more like a natural verigation than anything else.
Although you usually dont see that many leaves with it.
IF that's what it is then nothing to worry about.
Unless it just keeps on doing it it might be a slow grower.

 

[Metal Halide]

looks fine to me mate. Carry on