In my tank, I'm doing a small one. Not a lot of room for other designs. I haven't started it yet because I don't have a light. Check it out if you're interested.
I did add one to my fuge along with the macro. My main purpose is to promote copepod breeding for my mandarin. I really don't know how successful it is, but even with the cheato there is a small amount of growth on the algae scrubber and hopefully that's enough. Since you really can't see the pods I guess there's no way of knowing if they're breeding or not and flowing into the DT.