Any media???like recycled trash???jk. Wow neo nice invention, try to upgrade it like maybe a design or something,like an airpump to help filter the water.Maybe your on to something big!GL.
The first pic says it all. Put some egg crate on top of the tank. Put water jug on top. pump water into the top of jug and out the spigot through the egg crate back into the tank.
Very practical and very ghetto. When looks aren't important or in a pinch this should fit the bill.