What other birds do green cheek conures get along with?
Other small conures should do well with your green cheek. Just introduce them slowly in a neutral environment (not in the green cheeks cage/territory) Keep in mind though that if you get a second bird and keep them together in the same cage, both birds will bond more with each other than with you. You may find that your bird isn’t as friendly as he was when it was just you and him.