QUOTE (Film @ Mar 13 2010, 09:12 PM)

Are you joking? The clown needs to go ASAP! I overstock but I don't but clowns in 10g! Don't even think about adding more fish. You need to take the clown out and get a Yellow Clown Goby or 2. They barely get bigger than an inch.
Not to be an arse, but this isn't the best advice. I've heard of and seen many, many, many nano tanks with clownfish in there. The OP stated the clown is a young juvenile. The clownfish will get around 3.5 to 4" max if it's indeed a Percula or Occ. They normally take a few years to reach full adult size. IMO the main reason people don't recommend clownfish for smaller tank is how territorial they'll eventually get. Not very, but I've read that in smaller tanks they can become issues. I wouldn't be too concerned and honestly I think the fellow, if taken well care of will fare off well.
As far as what fish to add, I'd recommend to check out some smaller gobies as stated. Green banded, clown, yasha , hi-fin goby, firefish or a few other smaller gobies make good candidates. Some can even be paired off with a pistol shrimp and display a really cool symbiotic relationship.
I will say we as hobbyist should do the utmost research on what we put in our tank, but I try to never tell anyone to change something without a clear reason to do so. Check out the sticky of LGreen's thread. He's got an excellent overview of the types of nano fish along with their temperament and care requirements. Feel free to ask more though, that's the purpose of the board!