Ahh I see where youre going but I hate to tel ya, I don't think a nem is gonna work in that cube. The lighting for one, and the age of the tank. You need to have a stable tank for at least about 9 months or so.
On another note though, clowns won't automatically host anything, it's all a crap shoot. lol
Clowns have been known to quite frequently host corals but thats not alwasy good for the coral or the fish. My clowns were hosting an elegance coral, real expensive too, and it was awesome but they eventually almost killed it. i had to give it away. :-(