In order to create a diy aquaponics system, make use of the following instructions as listed below. step 1: wash the gravel and place in the bottom of the fish tank. then drill 3/16th” holes in the bottom of the grow bed at every two square inches so that the water can drain into the tank. drill a ½” hole for the tubing from the water pump.. Aquaponics is an easy activity which will provide you with the necessary vegetables and fish in a short amount of time. just follow the tips mentioned above and you will have great success in your attempt to grow organic food in your home. to read more about how to build an aquaponics system easily and cheaply, check out aquaponics 4 you.