Unusual fish for a reef tank

[i cant think]

So, as the title says I’m after some unusual fish found in reef tanks. Itd be a final fish and a showpiece fish that isn’t a wrasse. I have a 4x2x2 tank 5’ diagonal. I don’t mind if the fish is not always reef safe - I already have 3 not so reef safe fish (Fox, CBB, Jade wrasse)
I may trade in the Jade wrasse eventually. Im not bothered with money at the moment however if you know how much one would be at an average in the UK then please do add it.

 

[blaxsun]

Marine Betta.

 

[Wyvern]

Saddle puffer, angler.