If you can see green i'd say give it a chance. Nature is surprisingly resilient,just go out and look at any parking lot and you'll inevitably find grass growing through the concrete. My little runt has actually started growing again,i took it out of the box though and just have been keeping it in my window.
I spent like 5 hours making changes to my box which i'll post some pictures of later,i recessed the sockets ghetto style and added 2 more optional bulb spots,also gave it the option to add a middle hollow layer later if i want more height. It took so long because i guess the newer stock of rubbermaids is garbage. I put everything back together and i saw light leaking between the top and bottom box and kept trying to fix it before realizing it was the lid itself letting light glow through.. so covered it all in foil tape. my first lid never did anything like that.
Your plants seem okay to me about the same size as mine on the same number of days,when you say you think theres a pH problem do you mean the leaf i circled in red in attachment? That could be anything. LED lights are pretty intense they might cause some funkiness with chlorophyll.. Or heat if you have them close to the lights,what are temps in the box? Could just be from being in such small containers,are you feeding them anything yet? I started out using the miracle-gro organic soil until i noticed the runoff pH was between 4 and 5 with a dropper test but my plants never showed any issue. Since then i have switched to some pro-mix with limestome and replaced the top 2 inches of the containers soil with it and its better now.
Some pictures. 6 sockets on the lid,two are just hidden under the foil tape for now till i cut them out.
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I'm not sure what this thing is turning into but yeah,it's been above ground for a little over two weeks.
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How are your bulbs positions fixed? Did you just tape your bulbs in sort of a recessed position sticking through the lid a bit? And/or are they secured in another way?