Choices are endless, only limited by your imagination.
Below is one of my planted sumps, the plants area is a large matt of cryptcorne


below same sump during a water change

I also use planted sumps that sit between the main tank, and the sump that holds the equipment (pups, heaters etc)
I usually put them where they can get sun, with plants like papyrus (umbrella palm)

and because these intermediate sumps get heavy algae growth, thats where I put fry, after removing from the parents

In some of the same type intermediate sumps, I raise shrimp

Below is one of my planted sumps, the plants area is a large matt of cryptcorne


below same sump during a water change

I also use planted sumps that sit between the main tank, and the sump that holds the equipment (pups, heaters etc)
I usually put them where they can get sun, with plants like papyrus (umbrella palm)

and because these intermediate sumps get heavy algae growth, thats where I put fry, after removing from the parents

In some of the same type intermediate sumps, I raise shrimp




