mate... i would reduce the water level down to half or 3/4 full, if you cant almond leaves use blackwater extract. i had this problem with my first green arowana when he was smaller, i found lower the water and blackwater helped a little, i did get some tank mates with him, a tsn and a datnoid, you do not want fast moving tank mates like bala sharks as it can spook your aro. plecos are a good choice also, with age your aro will calm down
my old green finally calmed down once it was about 12-13"
you may also want to try some floating plants to provide some shade and cover, it may provide a calming effect for your fish
my old green finally calmed down once it was about 12-13"
you may also want to try some floating plants to provide some shade and cover, it may provide a calming effect for your fish