Columbian Tetra Advice

[ninjacheesefish]

In my tank I have 6 Columbian Tetras, along with some mollies, danios, rasboras and gouramis.

Is there anyway of telling the difference between male and female Columbian Tetras?

 

[ryan136]

I got sum of them few week ago n i bin lookin in it them and it just says it hard to tell the diff. Hav to try ventin the fish that shud work