Nibbled Tails

[2day]

Hi all. I just wanted to know why my blue guppies tailes are being eaten. I have about 60 guppies, 3 clown loaches and a pair of balloon mollies as well as a betta. The betta isn't eating tailes as i have watched him for hours. It might be the baloon mollies but I am convinced it might be them. Any help? Cheers

 

[Annastasia]

It's most likely the Betta. They don't always do it during the day though, a lot of aggression goes on at night too. Otherwise, it might be because you have a lot of males. How many males/females, and what size tank? Or it could be the Ballons, because you have a pair so the male might be frustrated with having only one female (2-3 is best) and taking it out on the other males. There's a lot of options that could lead to the aggression.