This fish is extremaly difficult to photograph. It is very thin and shy - it is very difficult fo focus. The fish swims just below the water level, what makes it difficult to have the proper light on the photograph - most of them were overexposed in the upper part, while they were uderexposed in the lower.
The picture is mine, the fish belongs to Małgorzata Noga from Wrocławskie Towarzystwo Akwarystyczne.

This
Dermogenys pusillus is only 3 cm long...