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.. Growing aquaponics systems . here is the seven-step of building a perfect layout. step 1: fish selection & locating them you would need to take into account all the healthy fishkeeping methods, much like keeping fish. some people like to use their aquaponics for carp, catfish, tilapia, and trout. i love the use of tilapia.. Our step by step aquaponics system instructions here: http://bit.ly/start_aquaponicsaquaponics system for $75 or less is all it takes to get started on your.