aquaponics flood and drain?

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Question by Brenda h: aquaponics flood and drain?
im just starting out with aquaponics and i have a 20 gallon fish tank that im going to use and a small grow bed with hydroton and i wanting to do a flood and drain with a auto siphon what size of tubing do i use for the auto siphon like i said the grow bed is 15 qrt and i have a 80gph water pump

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