12-27-2010, 08:32 PM
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Originally Posted by tanker
Until someone more knowledgable comes along....
Angelfish are territorial. Your existing fish probably thinks the tank is his and the newcomers are challenging him for territory. If you look at the fish profile it recommends a group of 4/5. I know from reading about female betta groups that if you have a bigger group, aggression is shared/diffused. Do you have room in your tank for another? (Get it from the same tank your new ones came from).
Have you got lots of plants and caves in your tank so that the fish can define "their" bit of territory. If not, maybe put some more in.
I'd take out all of your fish and put them all back in at the same time. Maybe move some tank decorations around so that your existing angel doesn't recognize "his" territory and try to defend it.
I'm no expert and have never dealt with this directly, so if someone who knows better tells you I'm wrong, listen to them...
At the moment, I would definitely separate the 2 who are having issues. If they feel strongly enough about it, they could kill each other. If you haven't got another spare tank, pop up to the shops and get some breeding boxes or nets to put them in separately. If you've got a big enough net, you can temporarily use it to put a fish in and balance the handle on the top of the tank with the lid down to hold it in place until you get something better.
Like he mentioned Angelfish are very territorial and there are many instances where new angelfish introduced to the aquarium are harassed by the older one or vice versa. It is ideal that you try and get all your angelfish at the same time