This tank work?

[Easton33]

So I have a 20g hexagon tank with a 70/300 Aquaclear Power Filter. In it, I will have several frag shelves on the walls, growing some corals for my main tank. ( Maybe some mushrooms,frogspawn,zoas,star polyps,etc. ) At the bottom, I'll have a couple pieces of live rock and an a sebae anemone. I also plan to have two pink skunk clowns that will hopefully become a mated pair. I probably won't have any other inverts besides maybe a star, some hermits, and snails.

What do y'all think? Any advice?