I currently have 5 silver arowana's 4-6inches in a 265 gallon tank. I started with 3 and added 2 more when the largest started harassing the others. I have added lots of floating plants throughout the tank. I have some zebra danios and guppies to distract him. But he continues to attack the others. Any other thoughts? I have temporarily quarantined him within the tank to allow the others a chance to recover. Do they have individual personalites making some more aggressive than others? If I get rid of him will another one become the agressor? Thanks.