Nute Burn? Or Something Else?

I am 90% sure you are overwatering that plant, nothing else. Are you really letting the cup get light, like styrofoam light before watering it?
 
If he was overwatering the leaves would be drooping. You dont want to let the soil dry all the way or it will kill the fine root hairs and they dont grow back. Meaning the plant has to grow new roots
 
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