Bangui Cardinal 3rd wheel

[Lilbitreefer]

Ao I have had these three banzai cardinal for about a month now. A couple days ago I noticed one had something white on his eye like an injury. He the disappeared for 2-3 days. When he finally reappeared his dorsal fine was bitten off and I noticed one of the other bangaii's hovering over him with a bit of aggression. They seemed fine when I first got them all swimming around together. Now it is just two while the other hides in the rocks. Any thoughts? Do I need to rehome him.

 

[eastlake]

I'd recommend removing the one that's being bullied as it sounds like the other two have paired off. The dominant male will usually kill the subordinate male, happened to me in a 150 gallon.

 

[Lilbitreefer]

So my system is full of hiding holes and thoughts on how to catch this guy?he was able to live in the rocks without being noticed for three days.

 

[ThRoewer]

I had the same situation with 2 males and a female that I had in a QT. It was all fine for a few weeks, but then the female hooked up with one of the males. Together they killed of the extra male so fast that I didn't get a chance to intervene.

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[anbosu]

Maybe try netting him when feeding? I had one hide for months in my 90 gallon - I actually thought it had died.