Pictures of other species here
Dermogenys pusillus male.
The female halfbeak (foreground) is noticeably larger than the male, and also paler in coloration
Fishkeeping Facts and Tips
Well planted aquariums are not only great looking, they are also very beneficial to the fish. They oxygenate the water, absorb nitrates, reduce algae and provide refuge for fry (and other timid species). Plants like Java fern, hornwort, Amazon sword, Vallisneria (eel grass), Cryptocoryne and Anubias can all do well in a typical home aquarium with the smallest amount of attention
Have a look at some of these related sites