You could use it as a quarintine tank if you dont have one, or you could have, I know it sounds crazy, but a algea tank. All algea, lr, and ls, I have 5 or 6 different types of caulerpa in my tank, it looks really neat. You wouldn't need alot of flitration on it, the caulerpa would keep nitrates down. You would only need a small power filter with a some mechanical filtration and some activated carbon. Just a crazy idea.
-Mark