I agree that you need to block light from coming through the net pots, but just waiting till you see X nodes and throwing nutes at it is pretty rough, although it'll work.
Once my plants start getting lime colored, I start off with a solution of .5 EC (250ppm) wait 2 days maybe then work it up .1 EC a day until the color goes back to the right amount of green.
This is one time in particular where it really helps to be able to read the plants in hydro.