Newbie Question; when can I add more fish?

i would advise against adding fish until a couple weeks after your tank is cycled. and even then only hardier fish such as clowns damsels gobies blennies. no delicate angels or any tangs for a while to ensure its established.

 

+1 to this.

Also with a fish that small, you might get a mini cycle if you add a big fish after it. Not sure the clown will cause that much beneficial bacteria to grow. It is a small fish in a good sized tank.