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I'm experimenting with the cycle times during the dark period, but currently have it on a longer cycle. Not sure if this is wise or if there is a need to keep the feeding/watering quite as high during the dark cycle. Though I saw some improvement once moving the tomato plants to the new system and keeping the pump on continuously, a few of the leaves on the plants still seem very "droopy" and "saggy".
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Generally plants don't need watering during the dark period (but shouldn't hurt) because they don't feed in the dark. Though if the roots are hanging in mid air they will dry out off and that would probably cause problems. I have not done an areoponic system yet, but I would want the roots to get some watering at night to keep them moist.