aggression advice

I have a quaker parrot and he came from 2 people before him, he was attached to the first person, then was OK with the second. When I have him out he likes tk bite me hard and he gets aggressive when I'm by my parakeets. How can I help this aggressiveness and biting?

I have two conures, a black capped named George (5M) and a green cheeked named Nova (2F). Genders are presumed. The Problem: -Nova is very aggressive. They live in a 7’ tall x 4’ wide x 2’ deep homemade cage. All materials are bird safe and have had zero issues with safety (aside from a light...