Aggression With Angels

[Rachel.Cody]

I have 8 angels in one of my tanks. Three are bigger in size. They have been fine together until today, now the big black one is attacking anything that comes near it and is staying to itself in the corner. The other two large ones are attacking each other and each other only. They usually all stay together with no issues. Just wondering what would cause this and if I need to do anything about it.


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[kno4te]

Seems a bit odd. Usually this behavior is seen in paired fish. Think any paired off?


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[tlindsey]

Space is a key factor, or add dither's or maybe plants to block line of sight.

 

[Oddball]

Is there a female staying closer to that corner than the others? My males got territorial once they cleaned a spot for spawning.

 

[Rachel.Cody]

I wish I knew how to properly sex them. The black one is staying in a corner on the far side of the tank away from everything else. The other two were lip locking then the smoke angel started trying the beat up on the koi. Charging, biting his side while the koi just tried to get away and hide.


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[Oddball]

angels with koi?

 

[xraycer]

I'm just guessing, but perhaps the black one is a female protecting a potential nesting area and the 2 fighting are males competing for the rights to breed with her.

 

[xraycer]

angels with koi?

My impression is that he meant koi angelfish

 

[Rachel.Cody]

angels with koi?

Koi angel. Sorry for the confusion lol


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[Oddball]

I wish I knew how to properly sex them.


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Sexing angels is not easy. You can 'best-guess' them within a long established group. The females will appear more plump than the males. If they're getting ready to pair up and spawn then, their genital papillae (spawning tubes) will extend: