My sump is a near zero maintenance filtration center for my tank
The first compartment is where the water enters and houses a skimmer, that I don’t use. It’s there “in case” I need to remove something from the water - medication, a spill, etc. it also holds my heater and some probes
The second compartment holds my algae scrubber, live sand, and tons of live rock with live sponge. The rock and sponge are a cryptic zone with no light. This is also where dosing equipment draws water from.
Between compartment 2 and 3 are media trays with matrix, and chemi pure bags.
Compartment 3 is the return pump, more live rock, and a phosphate reactor, that I only use if I have a spike I need to take care of.
I have zero mechanical filtration to clean, no socks, filter pads, no fleece rollers, nothing.
The setup is hands off maintenance free, aside from emptying the algae scrubber every 7-10 days. Open lid, remove handful of algae, close lid. Done