My LFS gets these in from time to time, just listed on the shipper's pricelists as small damsels....
He has some in a nano in the shop that have been there quite a while and have stayed about 1" in size.
I decided to try a few in my 15g nano. I picked up 3, one of which disappeared after a month or so. The remaining two are doing well. They are non-bothersome to other tank inhabitants and add some nice movement to the tank.
I'd really like to know what kind of damsel this is! I'm guessing no matter what kind they will grow some.
My best guess is that they are from the genus Stegastes, but that is just a guess.
Anyone have a clue??