Set the grow bed after you place the water pump in the fish tank. pass the tubing through the ½” hole. leave enough of the tubing to extend 3/4th the height of the grow bed and cut off the excess. step 3: fill the grow bed with the growing medium under the top of the tube. punch small holes at every two inches in the tubing in the grow bed.. Wicking bed aquaponics systems are especially good for growing root crops or tuber type ones. these include potatoes, beets, carrots, lettuces, and most other vegetables. in fact, this could be described as the main purpose for using a wicking bed in aquaponics..
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