I started a DWC at home. Growing lettuce, arugula and spinach.

For the nutrients I am using Masterblend, 15-0-0 Calcium, and Epsom salt (with 2-2-1 ratio).

My EC is about 1.7, PH is about 6.0

Some of my lettuce have these spots on them. What would cause this?

Lettuce with Spots

submitted by /u/fetbi
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