I used a Rubbermaid 100g tank and a lighting grate to suspend my media. Media was washable air filters on the bottom, graduating to Matala mat (white), then to lava rock (just about 3", not enough to clog). I have 2" going in, splitting to two 1.5" with venturis before my directional elbows, so I get aerated water going into the filter. Growing plants on top, dwarf hyacinth and elephant ear, to further colonize bacteria and deplete nitrates and phosphates. I also keep some barley bales submerged here.
What do you think of my setup?