Tannish/gold marks on a few leaves

Hello - long time lurker first time poster. This forum was my go to source of information when first trying to grow. So much thanks for all the long time posters. I'm currently on my 3rd grow(first 2 produced 1lb+ each under 600w LED using DWC)

Anyways I have a few leaves showing these brownish/tannish spots I can't seem to diagnose/find examples of online. Below are a few pictures. Can someone diagnose the issue for me and even better recommend some steps to fix? It's only on a few leaves in a packed 4x8 tent at this point. Maybe it's just nutrient burn? The tips are showing signs of it so I've dropped by EC by .2-.3

Growing indoors, in a tent, DWC with 5 gallon buckets, plenty of oxygen being pumped in, using hydroguard with Canna Aqua nutrients. Temps staying in low 70s with lights on, right around 70 with lights off. Currently in 3rd week of flower.pic 1.jpg

pic2.jpg
 
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