Building sump for Biocube 29

[Maggardjimmy]

i am thinking about building a sump for my Biocube 29. i am not sure how to get the water from tank to sump then back to tank. i have the coralife biocube which has the lid with 3 hinges. any info or ideas would be awsome.

 

[Reefing Madness]

How does a sump work? | Melev's Reef