I have had Frankenstein for a while now. He is probably around 5 to 10 years old. Just this past month he is becoming a pain with his agression. I think it's due to another parrot challenging him. I had to remove a pleco a few days ago because Frankenstein would attack non stop and then the big pleco would attack any fish around him knocking off scales of other fish. I'm gonna put Frankenstien in his own 75 gallon. I would never get rid of him but he is causing problems.