Am asking because the tank will be 630G + if I decide to go bigger. I can get the skimmer easily but am just asking if its really all that nessary for a fish only tank. If i have good filtration , live rock and sand. And my LFS has a plant they say suck up nitrates I've heard of it before but dont know they right name for it? If I also overly stock up on that and do 200gal water changes a month will that be enough? It seems like It? I've been contacting some public aquria who dont even use skimmers for there shark and ray aquriams. Thanks guys.