my 14" silver arowana started breathing strangely today. He is opening his mouth for some reason while he is breathing, like he is taking deep gasping. It has been going on for a few hours now. I checked my water perameters and temp and everything seems fine... I've never seen him do this before so I am slightly concern. Nothing drastic has changed recently, so I dont understand what is prevoking this... on a side note, my florida gar does occasionally nip at the arowana, so is stress from that a possibility..? I dont notice any wounds or anything on him. Please, any advice would be appreciated.