I have a 144 Oceanic half circle reef that I have had setup for almost two years now. I have gone through a slowly paced stocking plan and in the next two months will add the final fish to the tank. I had originally planned an Achilles Tang or PBT as the final show fish, but as my understanding of hobby has increased I have realized that neither of these fish would truly thrive in my tank which is only 54" long. Therefore, I am looking for suggestions for a final fish that will be compatible with my current tank configuration, population and is reef safe (I have lps, sps, and softies).

Current fish:
1- 4" Pyramid Butterfly
1- 6" Regal Tang
1- 4" Yellow Tang
3- 3" Green Chromis
1- 3" Blackcap Gramma
1- 3" Sunrise (Yellowtail) Basslet
1- 3" Bangaii Cardinal
1- 2" Yellowbelly Damsel
1- 5" Solar Wrasse
1- 8" Barred (Doliatis) Rabbitfish (will be moving to 240 FOWLR at the end of the year)
1- 6" Orange Spot Rabbitfish
2- Oscellaris Clowfish

All fish in the tank are well established, with the most recent being added almost 4 months ago, and most having been there more than a year. My problem is that I do not think I can add another wrasse due to my Solar. Leery of putting any more tangs in at this stage due to aggression from existing tangs for the more docile (Chevron had been considered) or not enough room (PBT, Achilles). Tried a Flame Angel and although I never saw him pick I had significant SPS polyp retraction.

Tank is skimmed with a Euroreef 6-2+, and has a well established fuge and nutrients are well within range during testing. Tank has a lot of flow (2 Tunze 6100 streams, plus 1500 gph from two return pumps).

Suggestions?