Nutrient Deficiency? Phosphorus?

Pabloelduro

Member
Hi y’all. It’s day 21 and I’ve been seeing blotches that seem to be bleached at first, then turn dark. I googled and went through threads and it seems like a P deficiency, but I’m not sure.
pH is between 5.5 and 6.5, 290 ppm with half strength GH nutes at 1-1-1 ratio. How do I fix this?
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