I'd hold off on the RD for now. Your tank seems large, but it really isn't for a large rd. If they don't get along you could lose the blood parrot in a hurry because it has nothing for weapons when compared to a rd. I'd stick to a decent sized Severum, something like that. RD's usually get nasty when they hit 5-6". If you had kept them together since they were young, it may have worked out well (is that what you did cichlidsavage?), perhaps that is what others have done. But I'm sure you like your parrot a lot, and I'd hate to see you get a nasty RD and have it hurt your prized friend. If you're thinking new world cichlids for tank mates, I'd stick to the safe choice, a severum, or some of the smaller cichlids that FreeNinety9 suggested.