Leave edges turning lime green and slow growth (pics+info)

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Hey there, I noticed today that my Think Different seedling was growing really slow and also their leaves were lime green on the edges. She is in a 20l container with MultiPro Grow Mix soil (never had issues with it), its important to say that temps in the tent have been between 30-35°c, can't lower them. I only have an oscilating fan pointing at my 400W HPS and extracting air. No intake (its a wardrobe and it is completely open). The only guess right now is the hot weather, but the other seedlings are thriving! Minimum heat stress signs on her. Today the temps are between 25-27°c, but no major growth appeared. You can see the pics are from 14th and 16th december both 23pm. Is she doing alright? Been feeding with Explosive Starter (organic root hormone) and plain ph'd water. Also the rooter was giving the water a ph of 4.6 I think, and I don't have ph up right now. (Only 2 waters were with it). Top layer was covered to avoid fungus gnat pest.

The soil is not a light mix, but it's not hot either, because I popped one seed in there and she didn't show any burning.

May I start feeding with veg nutes at 1/4 strenght? It seems a bit earlier but idk, I have Top Veg from Top Crop.
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How old are they??? They look great to me. They will build roots for a bit. You should see some nice growth very soon...a couple days
 
How old are they??? They look great to me. They will build roots for a bit. You should see some nice growth very soon...a couple days
When she "sprouted", she had a veeery tiny tap root, so I put a humidity dome and kept her in the dark for 2 days, she couldnt even stand but her cotyledons were open. Thought she wouldnt make it but surprisingly she recovered and started growing like 8 days ago. Maybe the pics aren't good but she is fading in the edges. Thought it could be N def but I don't want to burn her, so I asked here for help.
 
You're fine. If you are referring to the new growth being lighter colored, perfectly normal.
 
:toke:-- well, if her tap root was funky, it might put her behind on nute uptake now, and the heat didn't help either,...but there's stores in those cotyl's too,.. that said I really can't see that margin fade,... it too soon for any real defc.'s to be starting, but off pH, that funky root, the heat, all could be causes especially together,...
... what's this about 4.6 pH water, from a starter plug? That's crazy acidic, so tell me how you tested it,... a pH meter, liquid dye drops,..? What's the water source you have, pH and EC/TDS if you have it?
 
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