when to feed

i have srouts bout 1 week old in a top feed drip setup and i will be using gh series nutreints my Q is when do i start to feed???

Wait until you see your real leaves and the roots are touching the water. Then start very light and follow your GH nuts instructions for seedlings feeding strength, this usually around 1/4 stenght but check your product guide.

its a top feed into rockwool qubes so should i still wait til actual growth???

they have opened up and have two small leves so is that "growth"??

Those are not the "real" first leaves yet. Should not make a difference if its top feed or side feed as far as that goes.

You should wait until you see roots at the bottom of the net cup before you even think about using nuts yet.....