Red Belly Piranha aggression

[Miks786]

Hi everyone, this is my 4 foot grow out RBP tank, I notice that one of them is bitten on the head and tails, others also slightly nipped on the tail. I have 7 of them, what can I do to stop aggression?? I feed a lot

TIA

 

[Deadeye]

More hiding places would help a lot - it’s easier for them to get away from aggressors that way.
This is unfortunately the nature of piranhas, they are quite abusive with each other.

 

[tlindsey]

Hi everyone, this is my 4 foot grow out RBP tank, I notice that one of them is bitten on the head and tails, others also slightly nipped on the tail. I have 7 of them, what can I do to stop aggression?? I feed a lot

TIA

View attachment 1565252

You won't be able to control the nipping because young piranha are cannibals. They also will develop a pecking order.