Lost a cardinal :(

[SighKenny]

I’m sad to say that one of my cardinals was ostracized from the group and killed in the night and I only have 4 now I’m considered taking two back and just keeping two for a pair I feel absolutely terrible
I also wanted to know if now that they’ve been aggressive if I need to worry about it towards any other fish? I wanted to get clownfish soon but I’m nervous about aggression

 

[Beau_B]

From what I've read and witnessed, they will continue to kill each other off.

You can only keep two for a pair if they have already paired off. Beyond that, I would suggest trying to sex them via the vent method. 1 for females, 2 for males.

I have yet to be successful mating a pair and only have a solo...

 

[Steve1500]

From what I've read and witnessed, they will continue to kill each other off.

You can only keep two for a pair if they have already paired off. Beyond that, I would suggest trying to sex them via the vent method. 1 for females, 2 for males.

I have yet to be successful mating a pair and only have a solo...

Can you please tell me what the vent method is and how to perform it on benghai cardinals? Thanks! I’ve got what was supposed to be a mated pair from DD and one is attacking the other. One has its mouth open and I’m not sure if it’s injured or brooding eggs.

 

[Beau_B]

How to sex Cardinals

 

[Reef AquaCult]

I’m assuming your talking about bangai cardinals ? The dominate fish will kill off the weaker ones until there’s only a pair left. Unless you have a very large tank that can support multiple pairs. If you can identify the pair then I would remove the remaining fish.