Keeps happening!

This keeps happening to me. The first true set of leaves keep turning yellow at around 20 days. I fed 1/4 strength top dressing about a week ago and 3/4 strength today. Roots original, hlg135 rspec,78 degrees, 58% rh. 4” intake, fabric pots off the ground. What’s going on?
 

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I wouldn't worry about the first set of leaves. They look to be completely shaded so the plant is likely just dropping them as they're not doing anything anyways. Also i'd stay down on the feeding. A whole plant pic would be super helpful. But from what I can tell from these two pics, they're pretty dark green up top and getting tip burn which means too much nutes, specifically nitrogen. So I'd give only water for the next feeding or two and see what happens.
 
I would just let them ride out now they look pretty full on nutes so let them burn them off for a bit.
 
The cotyledons and first true leaf arent made for sustained long term growth. They're moreso a way for the plant to gather light and store that energy, until the plant needs it.

They're litterally there to be cannibalized by the plant, and it's doing just that. I'd just leave it until its crunchy.. or you can OCD about it and remove it, whatever feels right to you :D
 
I wouldn't worry about the first set of leaves. They look to be completely shaded so the plant is likely just dropping them as they're not doing anything anyways. Also i'd stay down on the feeding. A whole plant pic would be super helpful. But from what I can tell from these two pics, they're pretty dark green up top and getting tip burn which means too much nutes, specifically nitrogen. So I'd give only water for the next feeding or two and see what happens.

Whole plant pic.
 

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