i have an oceanic sump that came with no directions, or at least that's what the guys from the aquarium shop said. the sump seems to be divided into 2 or 3 parts. the right side has an area that has the water dumping over a filter from the hose returns which also has bio balls in it, and in the middle is an area where the protein skimmer is located. on the left is the area which i'm unsure of, and am wondering if it is where the refugium is supposed to go. it only has a pump on the bottom, but the area seems to be sort of set aside, but for what i don't know.