Yellow/Brown spots / Necrosis Please help

Just wondering if anyone could help me solve this problem with a couple of my plants before it gets worse.

They are 2 and a half weeks old and have been given no nutrients yet, although they are starting to yellow on the very first set of leaves so i'm thinking of feeding them next water.

They were in 1.5 l pots untill today when they were transplanted into 5l pots.

But yea, as the title says, happening on the fan leaves - Any help would be greatly appreciated

not sure. but it looks like it could be lack of nitrogen. or i cant tell too much. but are the edges of leaves flairing upwards? if so it could be too hot.

If you repot the fresh soil should hold enough nutes to not have to feed for a while, can we have pics of the bottom leaves that are yellowing. They don't look too bad and are certainly nice and green, what soil is it they are in? I'd say that it dosen't look anything serious at the moment, maybe after the repot stick to plain water and see if it gets any worse or better, if it gets better then it just needed a little feed. Imho i'd have to say just a touch of heat damage as the plant looks quite healthy although if the bottom leaves are starting to die of then it might be a deficiency. In soil with a repot i'd have to say that the last thing you should do is fertilize until you have rulled out a few other things. See how the plant does in its new soil and pot before fertilizing and check the temps as well.

Looks like that soil has plenty of nutrients in it. If they needed food the whole leaf would yellow not just tiny spots.

have you foliar sprayed them.? i just sprayed mine yesterday. i forgot to turn the fans back on. they did the same thing. as yours. i got little burns from that,