Wilting plants ! Please help

What is your ppm?
My PPM is 1900 , Just purchased a nice tester..
I believe it should be around 1200 .
I will make the change.
Is it possible that the PPM was way to high and made the plants wilt ???
Thanks for any thoughts.....
Would a 2 day flush of ph down just water help or hurt??
cheers,
 
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