Nute burn or need more nutes? Help please!

Hi everyone I’d really appreciate some advice. These are week 6 veg. Just flipped them to 12/12. Do they look like they need more feed or they’re burnt? Or something else? I’ve only been giving 50% measures on feed (ionic soil grow).

Soil grow using easy feed system. 6 pot 22L.
Using LED quantum boards.

Thanks in advance!
 

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They hadn’t been watered/fed for 4 days so I’m assuming it’s feed they require over roots drying out. The pots felt light so gave them a feed / water last night. Will see how they look later. Thanks for that. I was worrying they look slightly light in colour.
 
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