there isn't any drainage for those trays under your plants. You are creating a plumbing nightmare, to save $30.00 worth of nutes?? If you are not going to do a perpetual grow, just run them all at once, this setup may sound neat.......

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http://www.rollitup.org/grow-journals/53595-vv-singing-blues-seed-perpetual.html
http://www.rollitup.org/grow-room-de...p-journal.html