might have nutked my clones

I just got home i was away for a few days and i had told my friend to go water my clones, as i just got home and took a look he had watered them with the bottle that had 20-20-20 nutes mixed exactly as it said on the package...he did this about 6 hours ago and they look fine to me is there anything i can do or will they be alright or what? this is my first grow and im kinda lost right now, can anyone help me out?
 
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