[digital-audiophile]

Basically, yeah.

There are a few different designs, some people use a series of baffles to maintain water levels in the skimmer chamber and to control micro bubbles. A cool design though that I think I just got my head around (and I think I am going to swith to) has just one baffle in the middle just above the water line with a hole drilled in the lower part of the baffle with a ball valve.

If you have room for the sump it is something to look at, hwoever you would need to either drill you tank or look at a hang on overflow to move the water to the sump, and then a return pump plumbed in to return the water.