i agree i think the clown in itself would be enough will a small clean up crew, plus you gotta be vigalent, cuase a tank that small changes can happen really fast( ammonia, nitrate,nitrite) and that will kill everything in there, good luck though, you should look in the nano-reef section of the site as to the fact that i have no idea what to do about filtration ect for a tank that small, good luck though
Brahm