Here is a video of my sump
https://youtu.be/wHx-GhDkmLQ
It is a 20 G long tank. Water goes through a socket filter 200 u that I have to change every 3-4 days. That first chamber has a pump sending water to a Media Column with Siporax. The water goes also through 2 Hamburg matt filters to the chamber where the return pump is (~700 G/hour). That chamber is full of Matrix in media bags. As you have seen I also have plants.
It has been working for a month. As of today is doing the job.
Best
Daniel
Ps. The white PVC tubing has 3 battery operated air pumps. If electricity goes off, they start working and the air push water from the return chamber to the first one. Keeping the bacteria in the Hamburg matt filters alive. ..... I hope ... LOL