Random thoughts:
I like Siganus vulpinus (foxface rabbitfish) a lot. It eats almost any algae. It is peaceful and doesn't bother its tankmates. It would do well in a 180-gal tank. I am not familiar with the two species you mentioned.
Tangs: I think all three of the species you are considering would NOT be good selections for a 180-gal tank for the following reasons:
Acanthurus dussumieri has a maximum adult size of 20". It requires a tank of several hundred gallons to thrive. (P.S. -- Have you found one of these available? If so, how much are they asking? Just curious. I don't want one, I just wanted to know how much they're going for because I don't recall seeing them available.)
Naso lituratus has a maximum adult size of 18" and I think a 180-gal tank is really too small. "The species will grow to eighteen inches in the wild and it is simply outright cruel to keep one in a too small, or too short system in captivity." -- Robert Fenner, Wetwebmedia, Aquarium, Pond, Marine and Freshwater Fish, reef tanks, and Aquatics Information
Acanthurus lineatus is an extremely aggressive tang and it would be a disaster to put one in a 180-gal tank with the fish you have now. This fish is found on the edge of the reef in very turbulent water. It requires very high water flow and a very large tank. "Though this is a commonly used species when small, this fish can become an unholy terror towards its tankmates, getting progressively worse with growth. In the wild it reaches fifteen inches in overall length." -- Robert Fenner, Wetwebmedia, Aquarium, Pond, Marine and Freshwater Fish, reef tanks, and Aquatics Information
In general, I think all three of your choices are problematic for a 180-gal tank, even the Naso and the Dussumieri. The clown would be a disaster in a 180-gal tank once it matured.
I positively adore fairy wrasses. There are dozens of species in the genus Cirrhilabrus that would be great additions to your tank. I would choose one species and then get one male and two or three females. I would not mix fairy wrasse species in a 180-gal tank. I think it would be easier to just stick with a harem of the same species. The top of the tank MUST be jumper-proof.
Good luck!
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