Aro Not Eating And Swimming Vertically

Hi all,

I need some advise here from you guys.

My Arowana has not eaten for nearly 1.5 months and have recently (about 2 days back) developed a weird swimming behaviour - looking as if it lost its balance and swimming vertically. Please advise how do i get it back to shape again.

Will putting Epsom salt do the trick?

rdgs,
Nicholas