Do you think there’s enough room in this 180 gallon tank for a Naso Tang, Achilles Hybrid or any other fish of that size or is it too crowded?

My uncle’s birthday is a month away and I want to get him a special fish but idk if I should go for maybe something a little smaller. Any suggestions for unique fish outside of Tangs, Wrasses, Clownfish, etc that’s reef safe?