Another ID Assist?

[M.Dandaneau]

Yesterday was one of those days we all hope for when we go to the pet shop but rarely have......I was able to purchase three tiny waspfish (1/2" or less) being held in a brackish tank under the name "Butterfly Gobies".
They look very much like Paracentropoon longispinus, but I'm not aware of these being brackish.....anyone with knowledge of near relatives?
At $3.99 each, I'm thrilled with them, and of course "converted" them to full marine about 5 minutes after walking in the door, where they started snapping up adult live brine instantly.
We also picked up a beautiful Peacock Mantis shrimp for $16.99 and a basket star that stretches almost 18" accross for $19.99.
Merry Christmas to me, Merry Christmas to me...........