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Any people out there use N.F.T.?

In a Nft system with a 15 gal. Tank, we add 5mL of Clorox bleach every other day to help prevent root rot. Now I have heard different things on this but what the correct dosage? At what level does Chorine become toxic?

I am sure this has been covered before but I set my room up with a 600w hps. I have been thinking about getting an led to cut down on electricity and heat. My main concern is plant production. So to the vetters out there who have tried both, what are my realistic expectations? How to they really...