GARF'S olive barrel = bubbles and sun

Hello, today we are going to make two coral growing tanks from a plastic olive barrel. These barrels cost us only $5.00. We cut the barrels in half with a Skill Saw. The opening is positioned so that the pipes can be used for draining the tanks. We are going to set the barrel halves so they are end to end. The pipe will connect them so the reef water will flow through both tanks before it returns to the filters.