Stocking question

[Zante]

First of all the description of what is currently there:

The tank is 5x2x2 feet, which should be approx 150 US gallons.
There is a 3 foor sump with a refugium stuffed with macroalgae.
It is lit by two radions
Circulation is provided by 2xVortech MP40 and 2xAPS 1580gph pumps

Current stock is:
a few strombus grazers
a few turbo snails of different kinds
5 nassarius snails
2 tuxedo urchins

1 pair of pistol shrimps
1 pair of coral banded shrimps
6 cleaner shrimps

1 lawnmower blenny
1 pair of Randall's gobies
1 yellow tang
1 pair of percula clowns
1 pair of coral beauties
1m3f McCosker's flasher wrasse
4 firefish (strong suspicions of 2m2f)

When one bubbletip anemone that I really like comes along that will be the last of my planned additions, then it will be corals.

I am told that I could still fit some fish in there.

I am happy with the stock I have now, the tank looks great, but, should I start feeling the itch, what kind of fish or invert do you think wiuld fit well with the tank and its current population?

[Timfish]

With a pair of Coral Beauty's good luck adding more fish. You didn't say how old the system is or how long you've had the various fish in the system but once a pair of dwarf angels pairs off and gets established they have the potential of getting very aggressive. Your Coral Beauty's may decide to start taking out what you already have.