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Couple of startup questions. Please help.

My 13 yr. old son and I are starting a basic flood and drain system. Two questions: If our tank is 100 gallons, and our grow container follows the 1:1 ratio suggested in Bernstein's book, how much of the water do we "flood" the grow space with at a time? Too much and the fish don't have enough water. Too little and the plants don't have enough water, correct? Also, if we are doing system where the water drains back into fish tank using the same pipe that pumps water into grow space, won't the water pressure at the bottom of the fish tank prohibit full draining? Thank you for your help.

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