ya sure

the reason people use hydro is because the grow media is devoid of soil thus the nutes must already be in a stage in which a plant can use them.

when using organics the micro organisms that live in the soil are there to convert things like worm castings into a usable form of plant nutrition but this takes time thats why some prefer hydro because plant growth is faster(no difference in bud)

so if your gonna grow hydro i would use chemicals because you will have faster growth. your rez most likely wont get root root. you can use h2o2.

i am an organic man myself buy if you already have the system i would use chemicals