My baby arowana (5 inch) hasn't eaten since I got him last Saturday (4/28). He ate a cricket at the pet store the day I got him and he hasn't eaten since then. I have the water in his aquarium at 78 F. He is in there with a 1.5 inch pacu, 2.5 or 3 inch Oscar, and a 4 or 5 inch clown knife. They all have plenty of cover and space to themselves and get along just fine, also all my other fish are eating, just not my arowana. I don't believe he is trained to eat pellets but I know he used to eat crickets and I always try to feed him them. (And don't worry I have a big heated fish pond ready for them when they get bigger). If you have any suggestions on what I could do about this please help.