Annularis Angel- they have beautiful color and if you get them in juvenile stage you can see them change twice! pretty amazing if you ask me, and for a large angel it doesnt need as much space as others do.
True Percula Clownfish- I would get a pair of these and have them host an anemone. If lighing isnt available dont worry, just get a pair and they will look amazing swimming around in your tank, everyone always loves to see a pair of clownfish.
Bullet Goby- This fish isnt the most attractive fish, but it will keep your sand clean and its fun to watch
Flame Hawkfish- Beautiful color and great personality, youd really love it.
Hippo Tang- beautiful blue color, very active and extremely fun to watch, they have a great personality once they get used to their surroundings, and definately not a bully.
Blue Jaw/Throat Trigger- a male and female pair would be brilliant in a 210. people think triggers are not friendly but the blue jaw is one of the more peaceful triggers to keep in a tank. the relationship between the male and female would be something amazing to watch.
Carpenter's Flasher Wrasse- 1 male 2 females... the courting that would be going on would be awesome to watch. they are active fish and very personable. they love to show off and watching the male trying to attract the females is awesome.
this would give you 11 fish in a 210 gallon tank, which would be a good amount and it would keep your tank very active. if i were you, this would be the exact list i would get haha its simply brilliant. and eventually if you decide to turn it into a reef, youll have one fish to worry about and thats the annularis, but by that time he should be so used to the mysis he will forget about coral. triggers might harm inverts, but blue jaw tend to stay away... let me know what you think