I have two blood parrots in a 55g. When we first got them, they acted like a pair, defending a small pot I have in a corner. Last week they started fighting, nothing serious, just not what they usually did. One of them injured his eye, so I quarantined him. Once the eye healed up, I threw him back in the 55g, and he immediately started whoopin the other. Now neither parrot really sustains much damage since they cant really bite eachother, but its no fun to see one hiding the entire time. So one has to go. I'll post some pics, and help me decide. (My favorite is the lighter one, but technically they are my girlfriends so...)
