blood fin tetras

[Knuc dog]

hey jsut have a question about blood fins and how you can tell if they are male or female?

i have two that constantly chase eachother around, but never nipping or anything. its as if they are trying to swim in sync?

 

[cometcattle]

Here's what I found:

http/www.fishprofiles.com/profiles/fw/pr...charax+anisitsi

 

[Lateral Line]

Apart from the hook that article mentions, (which is often difficult to see), females are always a little deeper in the body and wider when viewed from above.