I have a 200 gallon FO
saltwater tank with a miniatus grouper (4-5 inches), a foxface (3-4 inches), and a clown trigger (3 inches, the most recent addition).
I would like to add one more fish and am seeking advice about which fish would be most compatible with my bunch, with special emphasis on fish with reputations for being hardy and disease-resistant. I know the clown trigger has a reputation for being mean and would like to add another addition while the trigger is still small to increase the chances of everyone getting along. Likewise, I know groupers can get rather aggressive too from personal experience with a panther grouper who lived 12 years in our tank until we lost him last year.
Possible fish I've been looking at are the naso, sailfin or purple tangs and the harlequin tusk (though a bit unsure because our previous grouper hated tusks/wrasses with a vengeance and we recently had a tusk that died). I'm VERY open to other suggestions and would appreciate any advice you have.