Nute burn? Or something else?

sakrei

Member
Plants are master kush and jack herer. Have two 300w purple led mars hydro lights in a 4x4x8 grow tent. About 1.5-2 months into the grow and have been dealing with this problem from the beginning. All plants have it. Using fox farm soil. Used fox farm nutes to start. Tried stopping the nutes / flushing but problem persists. Noticing also at times yellowing of leaves. Checked pH looked fine (6.5) and am using tap water. Any ideas?
 

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