I finally got my 75 gal. tank set up for goldies. The tank is a reef ready oceanic with a built-in overflow box which I like because it keeps the surface clean. I am using a Danner supreme mag 7 pump with a 700 gph flow rate. The return is at the surface and divided in two for directional surface agitation. Iâ€™m posting pics of the sump and fluid bed filter that I am using. I figure I have about a total of 100 gallons of water and lots of surface area for good gas exchange. The sump is a 29 gal. aquarium. The return water goes through a 200 micron filter sock which is sitting in the middle of my DIY sock stand. The stand is made of egg crate, plastic ties and Â½ of a plastic cup. Itâ€™s very functional but I do worry about the cup leaching weird chemicals into the water. Would love to hear some comments on this subject. The fluid bed filter using k1 kaldness media is a 13 gallon rubber maid garbage can that has a bulkhead and tubing that drains back into the sump via gravity. The maxijet 1200 pumps water into the garbage can at a rate of about 295 gph. I have two gallons for k1. The maxijet tubing sits at the bottom to provide good stirring flow. There is also a medium size bubble disk at the bottom. Will probably add another after all media is in. Fluid bed filter The bottom of the tank is covered in about Â¼ inch of black sand. I have live plants in containers, rocks and a vintage aquarium mermaid as my dÃ©cor. The mermaid was filled with sand then the openings occluded with silicone.