Nope this would be to small for a clown you might get away with some of the smaller Gobies or a Firefish max of 2 very small fish.
I would doubt very much a nem could be kept in this small a tank lighting would be a real issue also maintaning the levels would be hideous if you have the light required to keep a Nem.
But these tanks look very effective with a shrimp Goby Pair and a Threadfin Cardinal then some nice coloured Rics/Zoas and a couple of well chosen LPS.