will a 1200 ppm hurt 3 week old strong clones?

Just transplanted my clones that were in small rock wool cubes into the big rock wool cubes, set up the res, mixed it up, and took a reading.. 1150-1200 ppm. They are strong with lots of white roots. Will this ppm concentrate hurt them at this stage? Thanks!!!!!!!!!!!!!!

It doesn't matter if you're on the NaCl or 442 scale, 1200ppm is pretty high. Try 750 ppm or about 1.0 EC.

ummm, yeah dude that is pretty damn high for clones my botanicare clones are around 500.