Josh,
Great topic, if you have the time, my 80 gallon tank is of all things in need of a DSB. I set it up about 10 yrs ago with an UG filter, and CC. I was wondering why I did this, then I dug out some of my old saltwater books, and that was what they were recommending. They also recommended wet/dry filters. I am so glad I did not use one.
I have had excellent luck with this setup, and 1 WPG lighting until recently. Can you believe it, I broke all the rules, and still have a nice tank. I agree with SaltH2o, the actinics will help with the mushrooms. Mine have always done well. Don't forget, a little reef solutions helps them grow (I think it is the iodine.).