Actually I change my vote.. It's got to be Blood Parrots...
Blood Parrots? that's weird, uh well I've only kept 2 blood parrots in my life and they were the least intelligent fish i have ever owned(Barbs, tetras, and guppies don't count), my bloods would run into walls and they actually chewed up their crap and ate it most fish just taste the poo and spit it out and leave it alone. I'm telling ya that some dumb fish.