Which parrots are you talking about? Blood parrots? Parrotfish (that are
SW)? Or the other freshwater parrotfish?
I'm guessing you mean Blood parrots. Those are the ones with the funny faces that come in a zillion colors. Some important things to know:
They are not a natural breed. Theres a lot of controversy about exactly what they are (I've read everything from a convicts, severums, red devil cross, midas cichlids being crossbred, to they being a severum mutant), but do know you won't ever find one in nature.
The only natural colors are the orangey yellow ones; any other colors you see, especially the purple/blue ones are artificial and thats NOT a good thing for fish.
Because of their shape, they are deformed. The mouth is especially an issue, and often as they get older they lose the ability to close it.
On the other hand, they are extremely personable, and are often described as doglike in their enthusiasm and ability to recognise people and be trained.