wow good qustion i tried a few tim difss ie 30 on 30 of blay blay blay so i say if not bust dont fix saw no diference in the changing so i sware by 24/7 .sometimes my plants send some of there roots straight into the resevor craze i know .plus nft works well with 24/7 it creates a film of water thats what nft is .i use many taks at same time they hold 70liters each so testing diferent ways is easy 4 me so the professor says 24/7 tried and tessted.stayslippery