First fish

[Starry]

Thinking of adding my first fish to my 3 month old 33 gallon. My sump/fuge will finally be up and running about this time next week (15 gallon), my pod population is booming, and and I think I'm ready ready for some fishies. What would be a good first fish for this system? I want small active fish that wont get aggresive. For sure I will be adding a true Perc at a latter date so must be compatable. I have a 1" sand bed and 52lbs of LR. Corals include Hammer frag, small colt coral, shrooms, GSP, Palys, and zoas.