New GC Conure Sudden Aggression

We had just brought in a 12 week old GC Conure yesterday from a person that had an accidental few eggs they ended up raising.

It was the sweetest thing right off the bat. It would lick you any chance it got and loved to hide right under my ponytail and even slept there a couple times since yesterday.
It was friendly to both my fiance & I.

We started the No-Biting training right away and so far they have stopped the lip and nose biting.
It is fed and watered well and we have it in a separate cage from our Budgies and Cockatiel.
It got along well with my budgies right off the bat but still is pretty mean towards the Cockatiel so we are trying to slowly get them comfortable with each other with a cage separating them but being able to see each other.


Just an 2 hours ago it actually went into it's cage all by itself and seemed to be sleeping in the corner.
We heard it quietly eagle shriek a few times and went over to say "hi" and see what was up.
When my Fiance' tried sticking his hand in the cage it bit at him and continued to make small screeches.
He closed the cage door and we let him be for another hour.

I attempted to talk to it some just a few minutes ago and it started doing his screeches a bit before I even opened the door.
I waited until it stopped and let my hand in and slowly did the "step up" command to which I got one leg and then some hard bites which I powered through and told him "no" and curled my hand in a fist so he couldn't bite my fingers and so my hand was still next to him.

He screeched a bit more and poofed up and pecked at my balled fist some more.
I waited until he stopped for a minute to pull my hand out and closed the door.

okay you need to slow down for starters and completely restart.

First thing how about we decide on he or she first? Calling your little baby "it" isn't exactly nice.

Secondly you need to put the conure cage in a separate room to quarantine for 30 days in case he has an illness.

Now I can't quite tell how long you've had them but it sounds like you've dragged them out of the cage straight away when getting them home. For a moment put yourself in his position, he's 12 weeks old, he just had a gigantic pink thing with a face that your entire being is saying wants to eat you grab you, take you from mum, dad and all your brother's and sisters. you've then gone in a box or a small cage inside an even bigger noisy bumpy box with the sky whizzing by at a million miles an hour, effectively you've left the entire world you knew and don't know what's happening. You've then gone into a new "world" where there's strange looking birds, some are small and friendly but others are big and scary and they make weird noises. You 've got your own little spot where the pink thing can't fit so you manage to get some sleep. Finally the next day the pink thing grabs you and starts making noises when you explore them and say hello which makes you upset. After a bit you find a spot that feels warm and cozy where the pink thing can't see you so you fall asleep, completely exhausted from the trauma. Then the pink thing grabs you again and puts you in the cage where you feel safe. Finally it all gets too much and you scream for mum or dad or someone you know, instead the pink thing comes over and shoves its grabby thing in your little safe zone and you scream in fright. with nowhere to go and it not leaving no matter how much you tell it you lash out to make it leave. Instead of leaving it just changes shape and stays still so you just start calling for someone to come rescue you. Nobody comes but eventually the weird thing leaves and you're left alone.

Sounds horrific doesn't it?

Now that's just going by what you have said, I'm sure that's not exactly how everything has gone and I'm sure I've made it out to be worse than it was btu you get the idea of what's going through poor baby's head.

So, after deciding if they're a boy or a girl and putting the cage in a seperate room you need to dial things right back.

Just sit next to the cage and read to them so they get used to your voice, then you can slowly get to a point where your hand is on the cage and then you can try feeding treats through the bars. It's hard not to be excited but it is the best way to do things, remember they can live to 30 so a couple weeks is nothing. Focus on just getting them used to you and get them trained to step up onto a stick during the quarantine. Once the all clear is given then you can slowly introduce them to the other birds. Just be aware that they may decide they want to bond with the other birds and not you though, this is a very common thing with multiple bird homes