Grow Mediums Seedling problems help please

[STILLSMOKIN]

Okay so here’s another try with the same result. Germed a seed then dropped in rockwool, left in humidity dome under led light. Then after some roots showed through the bottom of rockwool I transferred into 3.75in net pot with maybe .5-1 inch layer of hydroton. Had water touching bottom of the net pot with air stone underneath. Sprouted fine then I didn’t see much growth although roots are growing. Then it started to look like the the pics attached. Have no idea what I’m doing wrong, my first grow was the same setup except I used 6in net pots and it was a fantastic harvest imo. Temp is around 78 and humidity about 40-55% using RO water and hydro guard, no nutes, hlg 135 at about 30 inches. I only hand water around the rockwool unless it seems/feels pretty dry which isn’t often. Any other input is greatly appreciated
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Looks fine to me. Sometimes they grow out looking odd. Do you have some nutes in res yet? If not using tap you need to have around 150-200 ppm.

 

[STILLSMOKIN]

Just saw no nutes. There's your problem. Give that girl a little food. Roots look amazing. Need 150ppm actual grow nutes that's not including what's in it now.

 

[Mikenike]

So I started another batch of seeds, everything the same except I’m starting with about 150ppms in my bubble bucket with the water right at the bottom of my net pot and about an inch of hydroton under my rockwool just like my first successful grow. Things are looking much better than my other attempts. I guess they weren’t drowning but starving instead. I thought seedlings didn’t need nutes until about a week old so I figured I could save on some nutes by doing only water for the first week. Anyways I greatly appreciate all the feedback I can finally begin my led auto Scrog journal. Thanks for yalls time!
This is about the age where they would start dropping badly. This is Day 4 with about 150ppms in the bucket.