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Question
I bought our green cheek before he was able to eat on his own so I had hand feed him/her.  I would put him with my parakeets and cockatiels when they ate and he eventually stopped wanting me to feed him.   He speaks and is so much fun.
My problem is I can no longer allow him to play with the other birds because he bites them.  I believe it started when he was "playing" with them and realized they ran when he's bite them.  Then he began chasing them.  Now I cannot hold him and them at the same time because he attacks them.  
I don't know if I can break this awful habit.  I feel so bad for him because he gets lonely sometimes and yells to us but I just cannot trust him with our other "babies".
Any ideas?  I really need your help.
Oh, also sometimes he bitees my hands or eat harder than he should.  He usually plays with my hands and sometimes my ear.  BUT sometimes he hurts although his behavior shows me he wants me to cuddle him.  (He turns upside down on my chest so I will hold him in the palm of my hand and let him hold my finger while he sleeps.  He love to do that.)
Sometimes he also fluffs up and gets angry at me when I try to put him into his cage.  He likes being free to be with us and fly around wherever... whenever.  My big concern is we might forget and walk outside.  I clip him in the summer so he can go out with us.  
Anyway..... please help with any ideas you may have.
Thank you vsxu8hery much.

Answer
hi. thank you for your question.  in general, birds of different species do not get along together. even birds of the same species sometimes do not get along together, even if raised together. reason being, birds are territorial creatures. it is part of their natural instinct and highly prevalent in conures.  my guess is that he was "cool" with the 'keets and 'tiels because he was still young and they were all being raised together. however, when a conure ages and especially enters into sexual maturity, usually, they will become very territorial. territorial behavior is exhibited by biting, posturing, and generally terrorizing anyone who comes into their vicinity (with the exception of a chosen few). they will display such aggression to other birds, regardless of gender/age/species, as well as other humans.  
although you are concerned about him being lonely, i strongly encourage you not to handle the babies with your green cheek and to keep them separate from now on. with territorial behaviors, birds can be seriously injured or even killed by one another. better safe than sorry. it is probably also better that you don't handle them together either. the reason that he is biting you when you are holding him and the babies is also a territorial behavior....he is giving you a "warning" bite that others are around. my sun conures "warning" bites are probably some of the most painful bites that he has inflicted on me.  there really is no "breaking" of this behavior as it is part of their instinct. to him, he is "protecting" himself and you from "intruders" and will not understand why this behavior is unacceptable. it is something that i have just had to learn to live with from my conure and you will hear the same from most conure owners.  
in regards to him getting lonely, it is better that he spend time with you than the other birds when he is lonely. birds are flock animals and crave our attention, often screaming out to get it.  my suggestion is to spend as much time as possible playing with him (i like to keep my bird on my shoulder while i read mail, surf the internet, etc.). when you aren't home, you can leave a radio or the television on for him to be entertained. also make sure he has plenty of toys.  he will still scream and bite for attention, but that is because our little conure friends are easily "spoiled" into wanting all of our attention all of the time. this really isn't feasible and i suggest that if he is screaming even after you have spent plenty of time with him, that you cover him until he is quiet. try covering him for about 15 minutes and then uncovering him to see if he gets the hint...you may need to do this several times. sometimes my conure screams because he WANTS to be covered during the day for a "nap".  as far a him getting mad when you put him back...that sounds like typical "spoiled conure" syndrome. try not to react when he gets "angry"...put him back, let him know your the boss, and stick to your guns. if he knows that getting mad will keep him from being put back, he will continue to do so.  
on a cautious note, i do not suggest letting him fly around the house whenever he wants. my conure tends to get the biggest "attitude" when his wings are unclipped and he knows he is free to fly around and "run his own program".  sounds like your conure is used to doing his own thing and gets mad when you try to set limits.  letting him fly around whenever, wherever has probably contributed to the aggression you see when you do try and put him back. additionally, it is dangerous to allow a bird to fly around the house...many dangers exist for them as well as the risk of injury and death (drowning, being burned, harmful toxins in the air, running into mirrors/windows, poisonous plants...the list goes on). another risk, like you mentioned, is escaping the house when the door is opened. i strongly suggest you keep his wings clipped year round so as to avoid him escaping the home.  also keep a close eye on him when you are taking him outside.
i hope that this helps and remember...dealing with a conure is like dealing with a child...they will respect you and be more obedient when clear limits are set. i know they are so cute and easy to spoil, but for their own safety and well being, they need to have limits and boundaries. in the end, you and your bird will be safer and happier! good luck and i hope this helps! alicia