Originally Posted by Aiken Drum
Is there a dominant guppy that is doing all the aggressing? If so the solution would be to remove it.
The 2:1 F/M is to stop males overly bullying females so the interest is spread out between a larger number of females. Adding 10 females would probably stop the aggression between males and pass it onto females where it can be spread out between a larger number of fish. The downside would be guppy babies and overstocking the tank.
From what I notice, there is no dominant guppy. I wanted to put the perpetrator on time out so watched them carefully but all of them were doing it! They would even stay together like they were schooling but go in circles pecking on each other's tail. All of them have nipped fins, 2 of them looked worst than the rest.
I have a lot of live plants in the background of the tank, and today I added a few of my old plastic plants to give them lots of places to hide but instead they just crammed together on the right side of the tank.
I'm honestly at lost for words with their behaviour.