Sump.
1st section for the filtration pad.
2nd section for rowaphos and zeolite
3rd section for liverock and maybe some algae.
4th section for rowaphos and zeolite
5th section for Eheim 1250 and returen water.
Center pillar is to help holding the main tank.
Auto top off section, you know what it should be.
Sump photo.
Center pillar in the sump. Same height as the wall of the sump.