Black Widow Tetra

[Rover fish]

Hi there

Ive just purchased some black widow tetra and im having some trouble sexing them. I have read in more than one place the differences but it doesn't seem to help me much. can anyone put on a picture of both sexes and point out these differences please because i am realy struggling.

 

[soybean]

You may have more luck if you post in (or this is moved to) the appropriate subforum:

http/www.fishforums.net/index.php?/forum/29-cyprinids-characins-and-atherinids/

Try to get photos of your fish for comparison.