White fin bentosi

[AlexT]

Anyone experienced in sexing? I have 18. They are not skittish whatsoever which is a pleasant surprise. The tank is in my bedroom right by the door, and whenever I walk in, it's like I am invisible. The jousting going on in the clip, I understand males form a hierarchy?

 

[Byron]

Perfectly normal. Most if not all of the 148 (to date) valid species currently assigned to the polyphyletic genus Hyphessobrycon behave this way. Males constantly challenge, but rarely does this lead to physical issues though it can. But usually nothing more than a split dorsal fin.

 

[AlexT]

Sorry for poor quality. Did not want to turn the light on and disturb them. These two have been going at it, in the same spot of the tank for more than 30 mins. This going almost perpendicular to the elodea densa? Courting, or just two males displaying? Thanks.

 

[Colin_T]

2 males displaying. Females have a smaller more rounded dorsal (top) fin.