Neovespicula depressifrons is a species of waspish found in coastal habitats of the Indo-West Pacific region. Source: Wikipedia
(Neovespicula depressifrons) is a very rare oddball species that is found in marine and brackish waters through the Indo-West Pacific. This unique fish maintains a very manageable size and temperament. ... This fish is often referred to as the "Butterfly Goby," but it is not a goby. Source: Google
They are a wasp fish. They are popular for the big paddle-type fins. These Butterfly goby/wasp fish will prefer live, frozen, or freeze dried foods.
Should be HANDLE WITH CARE because it could sting you.
It is known as Freshwater Lion Fish
However, we have some in the tank, feed them with artemia and some natural cladocera we get from the ponds. They are doing very well, easy going and really are very cute. You can see them at the video. The paddle-type fins it looks Great.