It is bigger than I need, In 24 hours it plugs a 8"x 4" section of poly pad. I have been using a 4 layer thickness and rinsing it out daily.
The black is "trampoline fabric" is experimental . I would like to try some stainless fine mesh, To sluice out the big stuff, and keep it from releasing nutrients into the water.
The eternal gravel vac. The overflow needs a little help in the back corner. With 25 fish moving around and 600 gph flow. I turkey baster around the heavier solids. I got tired of gravel vacuuming. As it needed it daily.
The substrate is 1/4" deep fine beach sand.
Any fine sediments generally are taken out with the 600gph flow. The plastic habitat works well for waste control as it channels the flow towards the air lift. It has been working well to keep cichlids from killing each other. Male and female mauna with peacocks.
Then what ever mechanical leaves behind, gets churned up in a 50 Sq in 20 watt LED waterfall algae scrubber.
Typically I do a 35% water change every 1.5 weeks. At 20 ppm nitrate, or if my ORP meter gets below -30mv. It varies a bit depending on how long it has been since the scrubber was harvested. My tap is 12ppm nitrate.
Water changes are done in the basement, by isolating the 55 gallon drums and pumping out and refilling. Takes 30 minutes to dump, and 6:20 to fill. The dump water is used for irrigation.