Step 4: Add the fish tank stuff
Cut three pieces of hose: one to go from the pump up to the grow beds, and two to branch out into the beds. Drill a hole every couple inches on the two branching out hoses, and plug one end of each of them with hot glue. Connect all the hoses with the t-fitting and plug the pump on to the end of it's hose. If you pump can't lift the water high enough, shorten the hose as much as possible.
Zip-tie the air pump on to the cart somewhere. Tape a rock to the end of the air hose for an anchor and drop it into the fish tank.