My plant is sick, need help!!

Okay sere here it is, beginning of the 3rd week, 2nd week after seed. The leaves were healthy for the last two weeks, but week 3 the leaves are turning yellow and brown, and they feel like paper. So any help let meknow!

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Yes, I feed it FoxFarm GowBig, and I use Great White for the root growth. I feed about twice a week, or whenever the medium is dry.
 
ok youre feeding too much..lay off the nutes for 3 weeks..also do you use r/o water?

also in conjunction with grow big, use big bloom
 
I use regular water, then ph down it, because my tap water is a tad high. Okay, so just ph tested waterfor about 3weeks? See, my local hydro store told me that these nutes would be okay from seedling, I had some skeptism, I guess i had reason.
 
those nutes are fine..youre just feeding the plant too much..what kind of medium is the plant growing in? looks like you have it in rockwool
 
Increase the watering with smaller amounts. The roots are withering. This is why it's extremely important to have good drainage in your plantpot. A plant of this age should be green without ferts. You have to get the roots happening.
 
Alright, well, I did a semi flush and drained em, now Im just going to let them chill. I had to flush because, I had just watered again like 2minutes before I posted, because the rockwool was completely dry. I will start feeding it less, I usually feed it till the rockwool is soaked, then let it dry, that might bea bit much. So less and more. I just started three more from seeds, will see how that goes.
 
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