I keep a royal gramma with my wrasses. They dont bother him, he doesnt bother them.
Ive kept royal grammas with fairies, flashers, pencil, possums and all kinds of Halichoeres wrasses without issue. As long as they're not the big, predatory, aggressive species like lunares, I don't think you would have any problem. Good luck, royal grammas are one of my favorites :dance:

One of my favorite fishes, and I have always kept them in groups of three or more, depending on tank size, with them never showing any serious aggression, nor suffering much from any other fishes (within reason of course)...
This group of five has been together for more than 2 years with the pair of cherub angels, first in a 29g, and then moved into the current 40B in a Caribbean gorgonian biotope.
WOW thats a great lookin tank you have there! Ive thought of doin a carribean tank as well
I have a gramma in a 25 rimless with only a clown and he only shows territorial agression when the clown gets too close to his cave. other than that hes peaceful and minds his own business
I loved mine, until he took a magic carpet rideI would say be sure to have a tight fitting lid but with wrasses I assume you already do. Good Luck!
I'm surprised you can keep a group. I've always heard they can only be kept singly.
One of my favorite fishes, and I have always kept them in groups of three or more, depending on tank size, with them never showing any serious aggression, nor suffering much from any other fishes (within reason of course)...
This group of five has been together for more than 2 years with the pair of cherub angels, first in a 29g, and then moved into the current 40B in a Caribbean gorgonian biotope.