I have a 150 gallon tank with a H. Psittacus, H. Notatus, Cren. Multispinosa and I am having aggression problems. I think the aggression is happening besause of the Pike but I'm not sure at this point. The Notatus is constantly picking on the Psittacus to the point where I'm worried about it. Some of the Psittacus fins are a bit worn but so far no serious issues but I feel its not going to stop. The Pike is taking the entire bottom of this huge tank and keeps the other fish at the top where the Notatus picks on the Psittacus all the time, the fish have no place to go because of the pike. Now i'm trying to decide if I need to remove the pike and hope that everything will calm down or will the Notatus continue to bully the Psittacus. I really want the Pssitticus to be the main attraction in this tank but don't want to have to get rid of everything else either. Any advice? I'm thinking of giving up the Pike at this point but its so Rare.