The choice of livestock plays a vital role here especially when urs is a nano tank. First of all if u r a coral person then u would not choose a reef unsafe fish. U wouldn't want ur expensive corals to end up as food for them. And I think ur tank is too small to house a clown trigger. Juz my 2 cents.
For color, adding a variety of zoas, mushroom, yuma & rics can be quite nice. Soft corals like leather fingers, toadstool and lps such as branching hammer, true octo are good too.
Try google images of nano reef tanks might give u an rough idea of what to add.
Happy reefing.