I recently picked up a 2-3" FH and 2-3" oscar for my 150 gallon. The plan was to have an oddball set up. However, I wasn't aware of this fishes agresssion prior to the purchase...i know, i know, stupid me 
Here's the list:
8" common pleco
3" senegal bichir
4" black ghost knife
3" tiger oscar
3" flowerhorn
Should I move the FH over to a 55 by himself or do you think he/she will be able to toleratethe rest in the 150 gallon?

Here's the list:
8" common pleco
3" senegal bichir
4" black ghost knife
3" tiger oscar
3" flowerhorn
Should I move the FH over to a 55 by himself or do you think he/she will be able to toleratethe rest in the 150 gallon?