well you made it this far and left a semi coherent question....I could spend days answering this but I dont have the time. not being a smart ass mind you...you will not find a simple 1 answer response here on this forum because whatever deity you worship cant answer your question. only because I dont think your on point yet understanding how hydroponics works....do you understand PH yet?
I highly recomend spending some hrs reading this 420 Magazine ®
do homework on this and I will help you start to finish and guarentee a harvest...no homework....no help