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You know we eat almonds, beans and sunflower seeds for energy, right? If they were allowed to do what nature designed them for, they would become cotyledons or starter leaves. Seeds contain energy for us but they really are energy for the seedling to produce a taproot and first true leaves. Seeds are full of oils And starches to feed the seedling until it develops structures such as roots and leaves to harvest nutrients and energy for itself. Seedlings do not need nutrients.
Once it has a few sets of leaves and is a few inches tall it will require some nutrient in the media. The seedling will show you this by getting slightly more pale. Thats when u feed it.
i've lost many seedlings to the overwatering and too much nutes to soon also and all that has been said above is good stuff.. except the fan.
i've also lost a bunch of babies because of too much fanage... my seedlings, set up similarly to yours, are kept under a clear plastic solo cup on top of your red solo cup (why do most of us use red solo cups?) acting like a small dome, keeping delicate stems from drying out from too much wind/air for the first 5-8 days, giving them some 'no dome' time each day. if they stretch too much and start to droop, prop them up and when you transplant, burry the stretched stem up to the leaves.
I been doin it backwards al these years?.. I do spray clones occasionally but no dome... 85% success .. good enough for me..
seedlings can be victims of their environment. mine happens to be a little dry 35%-40%RH and a little cool 70*F. guess there's more than one way for most operations to be successful... just my experience.