The minor tetra is native to the Essequibo River in Guyana in South America , while the serpae tetra is native to the Rivers Amazon and Paraguay , so in the wild these two very similar species appear to be separate , so they would not interbreed .
The minor tetra ( '' Hyphessobrycon minor '' ) is a small fish from the Essequibo River in Guyana in South America , closely resembling its relative , the serpae tetra , from the Amazon and Paraguay . 
 In the wild , these two very similar species are separated geographically , so they would not interbreed .