I've had my LRWFO tank running for well over 6 yrs now and it seem to be losing its luster if you know what I mean. Does live rock need to ever be replaced? I do my every week water change and my fish look good but something needs done to that rock big time. I've thought about maybe adding a easy to take care of coral would help, but I don't know. Corals are too expensive and some are really hard to care for. Any recommendations out there?