My arowana seems to be hanging out around the bottom of the tank and laying there sometimes. He doesn't look the slightest bit sick from what i can tell. He doesn't really seem to like the Nutrafin Max predator sticks i have been feeding (he spits them out a lot) but he has been eating them. My water conditions are prefect for him as well. Hes only about 8" long i got him on Saturday and is currently in a 55g tank alone until he gets bigger. My heater is kinda old and wont hold an accurate temp it varies between 75 to about 86 degrees but i am trying my best to keep it at about 80 until i can get a new heater. could the change in water temp cause him to lay and swim around the bottom or could it be something else. This is my first arowana and i really like him so please give me some info or tell me if I am just being paranoid. Thanks a lot!!!