I have mushrooms, zoos, a crocea clam, and xenia in a 30 with a single bandensis right now. I also have a serpent star, and a spotted mandarin, and a true percula clown (both will be moved out when the cuttle is bigger.)
I had lost 6 cuttles before in breeder nets so I decided to just put one in the tank with tons of food - and it has worked great. I am moving him to ghost shrimp today, as he is fat on pods right now but a little big for them.
The tank is a 30 gallon hex so I vertically stacked the rockwork so that there are tons of hiding spaces and ways to get out of the light. I got a 70w metal halide Sunpod for the coral, but the light is from the top center, so there are lots of shadowy areas and the LEDs work well for him too-lots of dusk and dawn hunting.
I'll see if I can borrow my brothers good digital camera to get some pics.