Albino Pygmy Halfbeak

(Dermogenys pusilla) 

This surface dwelling, carnivorous fish is adapted to habitats varying from acidic, tropical forest streams to brackish mangrove streams.

It is identified by its small size and shape of the jaw. Males often have a red blotch on the dorsal fin, and can be aggressive towards other males. The species is ovoviviparous, meaning the young fry hatch internally in the female and are then born alive.

The Pygmy Halfbeak can be distinguished from the similar Forest Halfbeak Hemirhamphodon pogonognathus by the position of the dorsal fin which begins behind  the anal fin.

The species occurs in many Southeast Asian countries including Thailand, Malaysia, Singapore and Indonesia.  

https://www.ecologyasia.com/verts/fishes/pygmy-halfbeak.htm