35 gallon bin(sump)
10 gallon bin(bio ball holder)
hope this is enough for my 210g tank. will put couple bags of CR under the bio balls. im still working on a drip plate.
To increase the amount of media space, remove the inner container, add the pump and then pack it full of media. You can also make a cage for the pump with the egg crate so that the pump can be easily accessed. I'll take a pic of a drip system of mine to give you some food for thought.
This one is more of a spray bar because it was going to be pump driven (pumped from a wet sump), but the idea still will work. Just make the supply hose larger to accommodate the gravity feed. It is laid directly on top of the media. This system will need prefiltering or a layer of quilt batting placed under it.