Blistering and brown spots on leaves

Can someone please help me out. I run deep water culture 8-13 gallon pots. Everything was going good this is the beginning of week three vegetation

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Mundo, looks to me she needs some nutrients. Maybe this will help?

Nutrient that is higher in nitrogen and lower in phosphorus and potassium. Like maybe a 7-9-5 should do the job.

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What’s the solution PH :love_you_gesture: