Restocking 55 gl reef tank suggestions? UPDATE - Photos added

[Coralgurl]

Cover noted, my concern with a cover is my lighting and my corals. I have 2t5s, and vertex LEDs. I'm trying a birds nest frag and so far after a week it's still doing ok. Other corals are lps, leathers and mushrooms. If I put a cover on, what would be best to minimize effects on lighting in the tank.

Fish list looks like this based on suggestions:
Cardinal
Chromis
Royal gramma
2 clowns
Blenny - not sure what though, I like the Midas blennys...
Flame hawkfish....maybe
Candy hogfish...maybe