Brownish orange on leaf edges

About 3 weeks into flower noticing some brownish orange spots on the larger leaf edges. Have been running about 700 ppm gh hydro. Looks to me like some burn so have been flushing with pH balanced water. Keeping pH around 6.0. Would you agree it looks like some nute burn?
 

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Yes, nute burn for sure. Tough to tell from the pics but the hew growth looks better, doesn't it?
 
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