The skimmer is one of the standard cheap ones you find online. It's meant for installation on a canister filter intake and has an adjustment to control the ratio of water taken from surface to water taken from the bottom inlet.
What is that plant growing out of the water on the right on your driftwood?
In 2012, it was water sprite. Now it's 2014 and it's bolbitis.
And in two weeks I'm going to nuke this tank and start a completely new scape. I went three years with the same basic scape--lots of planting and replanting, but the hardscape was the same. I'm a bit chicken to toss out something that has worked so well for so long, but I've gotten bored with the old wood.
Like I said at the top; I got bored. So I emptied the tank, made some long-needed plumbing changes. Same tank, mostly the same hardware. I long ago went to peristaltic pump autodosers controlled by a Reefkeeper Lite (which also handles dimming the LEDs.) The surface skimmer DIY I'd done had worked great, but always required tweaking to keep the flow rate right. So I switched to an Eheim Skim 350. But the concept stays the same: almost nothing goes over the rim (no cords, no hoses) and plumbing is invisible in the tank. Helps to keep the natural feel.
I did the hardscape with some rocks collected by a local GWAPA club member. Driftwood by Tom Barr. Agonizingly slow hardscape placement by me. Once again, my wife said "finally"--that name will always stick! So you'll see some hardscape ideas I played with, then the final. We'll see if this one lasts for four years too.