Bloodfin Tetra

[JoeGuzzo]

i have two bloodfin tetra's in my tank, yes i know theyre a school fish and would rather be with more but honestly i only have 2 and they seem to be pretty happy with just them two and the other fish i have in my tank. they are very active swim around the whole tank chasing eachother, and along with my other fish whenever i have to stick my hand in there they all swim around my hand so theyre definitely,i think anyway if im wrong somebody tell me but anyway..

the reason i opened this post is because one of them always has color flucuations in it's red in it's fins. one moment they are as red as could be and 5 minutes later theyre pale with barely any red at all. i dont think it is because of stress or anythign because like i said i believe them to be very happy fishys and this is not a concern post im more of just curious as to why this happens and if anybody could tell me Thanks!

 

[Akendrum]

I read that this color change is during breeding. I actually have seen this and captured it on film. I'll put a link on here to my video.

http/www.youtube.com/watch?v=ikyf4h53vfc

http/www.youtube.com/watch?v=UsAZD-2P4jg

I collected some of the eggs from these breedings and they are just starting to wriggle around now.

Females are rounder, and males have more white on the tips of their anal fins.