Help have a little problem my leaves are starting to get light green tint + pic

i would say early sign of nute burn...They are still to young to be getting nutes especially 1/2 dose....i would have maybe gone 1/4 nutes then up to 1/2 in a couple weeks.

Less is More...meaning a little at a time is better than allot at once!

i don't feed my little ones til they show sign they are hungry....usually a little bigger then them.
 
Not nute burn. More like you need more moisture in the soil. Keep your soil nice and moist, not wet but moist. Organic grows need a moist medium to thrive. Also make sure your lights are not too low. Light bleaching will cause yellowing.
 
looks like early signs magnesium deficiency, though i havent seen it this early on before. i can be wrong you will know in time.

with mag deficiency lower leaves yellow and may even turn white while veins remain dark green. Blades die and curl upward.
 
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