Heres my new 75 gallon reef: 3-4" sand bed, 8x 54t5 lights and about 1300gph of water movement, I just order 100lbs of LR and euro-reef rs100. The sump has 4 chamber: inlet, fuge, sump for the skimmer with a filter tray that has room for bags or carbon, chem-pur or anything else I may need...