This came up in another topic but thought I might share separately. It may be a kind of old wives tale but I plant my seeds by the moon and also try and harvest by it. I plant and try and harvest during the first quarter as for the reasons explained in the link. I'm a outdoors grower but I'm assuming it would also apply to hydroponics. It may be a myth but if it has any advantage I'm willing to give it a try.
http://www.sgaonline.org.au/moon-planting/
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http://www.sgaonline.org.au/moon-planting/
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