12g... don't get a nem, imo. try getting some sort of LPS such as a torch coral, which are frequently hosted by clowns, look exactly the same if you don't know what you're looking at, and are much easier to keep.
i still don't understand this arbitrary dating thing that makes people come up with a 1 year date for getting nems. i would say it has more to do with ability as a hobbyist (as in people new to the hobby usually don't have a good enough set up or enough knowledge on aquariums until they've been tinkering in the hobby for a year or so, not that it takes a year to build up stability ;P)