You might consider and find a bio-tower and the lack of footprint it take useful, they can be as narrow as a couple inches or as wide as the largest PVC carried in your area,
and be almost as tall as a tank, or drill ports and be packed with biomedia,
They can be place outside the sump and stand but flow into the sump.
I have made them as narrow as 3" in PVC diameter and as wide as 8" and 5 ft tall.
The one above is @ 8" and made with clear PVC for the viewing portion, but normal PVC components were used for the other parts.
Below you can see standard PVC parts
A cap can be used to minimize spatter.
You might consider and find a bio-tower and the lack of footprint it take useful, they can be as narrow as a couple inches or as wide as the largest PVC carried in your area,
and be almost as tall as a tank, or drill ports and be packed with biomedia,
They can be place outside the sump and stand but flow into the sump.
I have made them as narrow as 3" in PVC diameter and as wide as 8" and 5 ft tall.
The one above is @ 8" and made with clear PVC for the viewing portion, but normal PVC components were used for the other parts.
Below you can see standard PVC parts
A cap can be used to minimize spatter.