Long winded answer coming... that is a BIG fish. Length is one thing, but blood parrot hybrids are very heavy bodied fish. If you aren't planning to kill the fish while it's still young, it'll grow, and it'll surprise you how fast (if you take care of it). I have never seen a 30 gallon a fish that size could comfortably turn around in. As well, you would be doing 50% water changes 3 times a week to keep up with its waste load. It's the goldfish in a bowl effect.
They are very aggressive fish intentionally bred to be too handicapped to act on their aggression. Some of the older strains I see in stores are developing less deformed mouths, and that means they can bite again. In a 30 any tankmate who survived the water quality from a big fish would run for its life 24/7. If I ever end up in jail, sharing a small cell with a slow moving slightly injured serial killer, I will be a lot more stressed than if I have to see him in a large open prison exercise yard...
So I would say NO.
BTW - I don't think stores are thinking of selling no matter what. The fish aren't expensive. I think they expect them to have very short lifespans in our tanks, and sell them as expendable, consumable objects. In one year with a 30 gallon, you could go through a few bloody parrots.