Hi Ruth,
Glad to hear about your new 12g
If this was my 12g, though, I would not keep a tomato clown as they grow to 6" long in the wild. More info on these fish:
http://www.marinedepotlive.com/tomat...h--clowns.html
I would also do weekly water changes and clean the foams weekly, especially if you have the two fish in the tank.