That looks like a leucistic domino damsel. Very rare find, I can't say I've ever seen one before. It is a very aggressive fish, but it might do well with a large group of its own kind (to disperse aggression), or with other aggressive species like dottybacks or larger wrasses. They're super hardy though, very tough to kill.
This fish does seem to be aberrant in color, which makes it really tough to ID with a more generic damsel shape.
Based on the overall color, I'd guess Amblyglyphidodon silolona, but the pelvic fin on those looks wrong to me.
So, based on the shape of the pelvic fin and the fact that it doesn't have a streamer coming off of it (like A. silolona,C. struhsakeri, and C. tingting do), I'm inclined to agree that it may be aberrant Golden Domino Damsel (Dascyllus auripinnis).
I agree with the above being it’s likely an aberrant Golden Domino Damsel.
Beautiful find though, and yes they can be aggressive but in a species only system that fish would be gorgeous. Especially when backed by the browner Softies like Leathers.
I found this image of a Dascyllus auripinnis, so I'm inclined to agree with @ISpeakForTheSeas and @i cant think that it's some kind of variation/aberration.
Other than the coloration - it's very similar to my domino damselfish.