Here is my 29g sump, main tank is a 60 gal
with ~30 mbuna
Overflow is a bean animal design coming down three 1.5" pipes.
First partition is coarse mechanical filtration
Second partition is kaldnes k1 fluidized media. I have a 15lph air pump with 2 bubble walls circulating the media
Third partition at one point was a series of bubble traps until I realized it was an eheim compact return pump actually causing the micro bubbles. It now has a pothos plant and does the fine mechanical filtration. I may try using matala mat in this partition when I need new media.
The return pump is a jebao DCT-6000 w/1" tubing