Nitrogen toxic? Please chime in

Watered today with a minor amount of nutes (half of half of what i usually give them) run off said about 750 ppm (not sure if that is accurate tho) if they do get any worse i will give them a huge flush then rewater with some nutes in the same day? or is that not how im supposed to do it
 
Maybe water plain once or twice. ? I'm not really sure where to go from where your at.

Yea i was thinking the same thing, i was more or less asking after i give them a big flush (if i do) do i water the same night with minor amount of nutes so they aren't completely washed out of them?
 
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