Try this link:
pH/PPM/CF for Various Vegetables

Slow down 500 is good 800 is better over 1000 you better have a really strong plant growing fast and strong. 1200 high 1500 really high over that your burning just about anything. That is left over junk from the overwhelming number of weed growers out there. I hate when my local hydro guys says grow safe man.

Thanks for the info. I tell my parents if they tell people I am doing hydroponics they should tell them that it is veggies instead of leaving it to their imagination.