Just finished this piece last night and I'm really happy with it. These are Banggai Cardinalfish (Pterapogon kauderni), a small tropical fish found in Indonesia. They are very popular in the aquarium industry. So much so, that they are now a threatened species. They can be bred in captivity, so if you are purchasing, be sure to ask whether they have been sourced from the wild or bred in captivity. There is no need for them to be harvested from the wild.