PLEASE HELP!! I need help figuring out whats going on!

They are two and a half week old seedlings under 24 hour t5 lighting. I first noticed the issue about a week after being in the solo cups. Two days later I fed them their first feed of mexican bat guano and bio catalyst, since then they have had two feedings and the new growth is healthy but everything below that has gotten worse. Any information in helping me understand and solve this issue is greatly appreciated. Thank you.
Darrons plants.jpgDarrons plants #2.jpg
 
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