The Dwarf Gudgeon or Red Flash Sarcocheilichthys parvus (Nichols 1930) is native to the Yangtze River Basin in China as well as Vietnam. It has been collected in Vietnam in the Pearl River drainage, within the Northeastern regions. In China, Red Flash samples have occurred in the Yuan Jiang drainage in Chenxi County Town, Hunan province as well as Guangzhou province and in other provinces of Eastern Asia. It is rarely seen in the hobby as wild imports from these regions are few and far between.
Their native habitats are slightly turbid streams and rivers. The bottom sediment usually consists of dark river stones.