so i got my silver arowana like 2 weeks ago and over the past 2 days he has been very slugish, he is about 4 1/2in long. he really hasnt eaten much iv tryed feeding him guppies, frozen blood worms and even pellets. when he does eat its very little (like 5 tiny blood worms). he only swims on the surface of the water (idk if thats standard or not for arowanas). i have 1 air stone and 1 bubble wall and i keep the tank at 80 degrees. can anyone tell me what am i doing wrong. any help is apreciated