What is This?

[mocha 75]

It’s a damsel I suspect but no idea which one.

 

[Aquadude1]

Looks like a red honey damsel. They can be feisty when mature ime.

 

[X-37B]

And they get big brown and aggressive. Mine next to a Tunze 6095 4+". Its bigger than my swallowtail angel. I have had it for 2 years from a 1" size.