abnormal behavior

so my silver arowana is about 8in long i got him about a week ago and i understand that they are surface dwellers but he has literally been sitting at the surface not even a millimeter under the surface and swimming kinda slowly since yesterday.. is this normal or if not whats wrong with him?

Ok, my jaguar has been having some problems. I have apparently not been aware of said problems though. I've had him for almost 10 years now. Recently (about 30 days ago now) I put some convicts in the tank with him. And even more recently, some crawfish. So first he started losing interest in...