Diy ecosystem filter questions/suggestions

[basslet]

I am an avid fish fanatic. For me reading about fish is just as much fun as keeping them. I was reading book called The Ultimate marine aquarium and I found a topic that caught my intererst. It was about the ecosystem filter which uses caulerpa as the primary mode of filteration.
Which I was thinking I could apply to my ninety gallon using a 20 -30 gallon acrylic tank as the sump, A pump to feed water back into the main tank via the overflow, pvc piping and aquarium cement to seal the piping and two shut of valves a few inches from the overfow to prevent flooding. The question is do I need a pump for the line that goes from the tank to the ecosystem filter? If anyone has any suggestions or diagrams of this project please feel free to share them with me.

[scubadude]

The question is do I need a pump for the line that goes from the tank to the ecosystem filter?

Hi basslet
depending on if your fuge is above or below the main display tank then you could use gravity to supply to the fuge or display. The most ideal situation would be to gravity feed from the fuge back to the main aquarium IMO cuz this will allow any live microfauna from the fuge to have better odds of survival and not have to worry about possibly getting shredded in a pump impeller.