Oh, and as far as a CUC.....

I would go with blue leg and red leg hermits and nassarius snails. Turbos, astreas, and all of the other snails don't clean the glass enough to really be beneficial, IMHO.
Also, the snails that tend to get on the glass, tend to get into your overflows. This happened to me this week. I had a slight overflow of the display because I have a Mag24 as a return and my overflows couldn't stand to have one being clogged.

Hermits and nassarius eat up the food not consumed by the fish, and will also eat poop at times. This is what you want... As Tebstan stated, put some extra shells in there so they can grow into them. That will keep them from fighting over larger shells as they grow. Hobby Lobby sells packs of decorator shells for a decent price, and it dresses up the hermits into nicer costumes. Of course, as with anything that moves, they can knock over frags, etc. Just glue the frags you get down well enough the first time and you should be fine. It's cool to watch the nassarius rise up out of your sandbed when you feed. It's like night of the living dead.

1" sandbed or less, larger is a detritus trap which will cause nitrates to hover at undesirable levels.