Weird light green/ brown blotches

Can someone help tell me what could be going on this is starting on some of the lower leaves of my 3 week old plants.
 

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Quick update- I have noticed today that some of the plants are showing signs of nitrogen toxicity with some slight leaf curl at the tips. Could this discoloration be related to that ? I’ve dealt with nitrogen toxicity before but never seen that discoloration on the leaves.
 
Thanks for that. Yeah it could be cal mag. This is what the leaves look like after a couple days. I’m not worried if it’s some sort of deficiency, I’ll get it figured out. Just worried about potential bugs, there are none as far as I can see unless I’m missing them, and I have sprayed in case. Does any bug make this kind of damage.
 

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