it's a black arowana so , but onest you have to see it inreal life the arowana has alot of space .i just made darker area's in the back to be 100% sure they can flee is there is agression while feeding ( the only time when there is agression.)it looks cramped but the fish have alot of room it's 1 meter deep sow.il try to take a clearer picture to show the space for the arowana