Absolutely awesome setup! I'm planning on running a kessel as week on my larger refugium as soon as I can figure out a good way to mount it. I bought the gooseneck but there's not a ton of places to mount it.I have a dual refugium setup as well and I really like the control I have over what I grow. In my first refugium chamber I have only cheato with a Kessil h80 on a reverse cycle from my main lights. I also have a ebay grow light panel on the side of the fuge that comes on if the ph drops to raise it back up (I also use this light if I overdose nutrients or they get high to burn them off).
My second fuge is more of a display tank full of Xenia. It houses a couple Black domino clowns and a bunch of lps frags. I love the display fuge as it has a ton of microfauna that makes it into the main tank.
The cheato is actually in the skimmer chamber in the back left of the sump