First clean Your clay pebbles, tank, and garden bed.
Then drill a hole in both sides of your garden bed that is big enough to fit your drains. Then put your drains in and make sure your side that drains the water is screwed in all the way.
Then place your garden bed on your tank and connect the pump to the end of the tube you want the water to come out of. After that fill your garden bed with your clean clay pebbles.
Plug in you air pump and connect a tube and a air stone to it.Place the air stone is the tank and fill you tank with water.
After your aquaponic garden has bin running for a few days test your Ph and make sure that it's around 7.Then you can get your plants and fish. Follow the instruction on how to put your fishes In
Enjoy sitting back as your garden runs it self!