Nah, it doesn't matter.
Here's what I prefer
seedling - 200ppm
small plant - 400ppm
12" high - 500ppm
12" - 24" - 700ppm
then flower
week 1-3 - 700ppm, still grow nutrient
week 4-5 - 1000ppm, bloom nutrient
week 6-10 - 1200-1400ppm, bloom nutrient. Or for safety, just keep on 1000ppm
week 10-14 - flush solution
Too little nutrient is better than too much.
If you need more info there is a
http://www.indoorgrowingstore.com/hydroponics_grow.htm grow guide here.