I prefer the sump/ref/skimmer setup I have. On 1 end is the skimmer, the middle is my ref and the other end is my sump/return pump. It gives me a place to grow my cheato/calupra as well as a safe haven for pods and other small critters. I have mineral mud and argonite in my ref to help with break downs as well as extra LR to assist.

I agree with bobby on the fact additional water and flow help the tank and a place for things to grow, as well it is a nice healing area if you need to put fish/critters/corals a place to heal up.